Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity a Well-known Seasoned Issuer? Is Entity a Voluntary Filer? Is Entity's Reporting Status Current? Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] Assets Current assets: Cash and cash equivalents Accounts receivable, net of allowance for doubtful accounts of $131 and $111, respectively Federal and state income taxes receivable Inventory of parts and supplies Deferred income taxes Prepaid tires on equipment Prepaid taxes and licenses Prepaid insurance Prepaid expenses, other Assets to be disposed of Total current assets Property, plant and equipment, at cost Less accumulated depreciation and depletion Net property, plant and equipment Real estate held for investment, at cost Investment in joint venture Goodwill Unrealized rents Other assets Total assets Liabilities and Shareholders' Equity Current liabilities: Accounts payable Federal and state income taxes payable Accrued payroll and benefits Accrued insurance Accrued liabilities, other Long-term debt due within one year Liabilities of discontinued operations Total current liabilities Long-term debt, less current portion Deferred income taxes Accrued insurance Other liabilities Commitments and contingencies (Note 8) Shareholders' equity: Preferred stock, no par value; 5,000,000 shares authorized Common stock, $.10 par value; 25,000,000 shares authorized, 9,309,051 and 9,288,023 shares issued Capital in excess of par value Retained earnings Accumulated other comprehensive income, net Total shareholders' equity Total liabilities and shareholders' equity Accounts receivable allowance for doubtful accounts Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares issued Common stock, par value Common stock, shares authorized Common stock, shares issued Income Statement [Abstract] Revenues: Transportation Mining royalty land Developed property rentals Total revenues Cost of operations: Transportation Cost of Operations Mining royalty land Cost of Operations Developed property rentals Unallocated corporate Total cost of operations Operating profit: Operating profit Transportation Operating profit Mining royalty land Operating profit Developed property rentals Unallocated corporate Total operating profit Gain on termination of sale contract Interest income and other Equity in loss of joint venture Interest expense Income before income taxes Provision for income taxes Income from continuing operations Income from discontinued operations Net income Basic earnings per common share Continuing operations Discontinued operations Net income Diluted earnings per common share Continuing operations Discontinued operations Net income Number of shares (in thousands) used in computing: -basic earnings per common share -diluted earnings per common share Statement of Cash Flows [Abstract] Cash flows from operating activities: Net income Adjustments to reconcile net income to net cash provided by continuing operating activities: Depreciation, depletion and amortization Equity in loss of joint venture (Gain) on sale of equipment and property (Income) from discontinued operations, net Stock-based compensation Net changes in operating assets and liabilities: Accounts receivable Inventory of parts and supplies Prepaid expenses and other current assets Other assets Accounts payable and accrued liabilities Income taxes payable and receivable Long-term insurance liabilities and other long-term liabilities Net cash provided by operating activities of continuing operations Net cash provided by operating activities of discontinued operations Net cash provided by operating activities Cash flows from investing activities: Purchase of transportation group property and equipment Investments in mining royalty land segment Investments in developed property rentals segment Investment in joint venture Proceeds from the sale of property, plant and equipment Proceeds received on note for sale of SunBelt Net cash used in investing activities Cash flows from financing activities: Repayment of long-term debt Repurchase of Company Stock Excess tax benefits from exercises of stock options and vesting of restricted stock Exercise of employee stock options Net cash used in financing activities Net (decrease) in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of the period Notes to Financial Statements Basis of Presentation Stock Split Recent Accounting Pronouncements Business Segments Long-term debt Earnings per share Stock-Based Compensation Plans Contingent Liabilities Concentrations Fair Value Measurements Discontinued operations Assets, Current Property, Plant and Equipment, Net Assets [Default Label] Liabilities, Current Deferred Tax Liabilities, Noncurrent Accrued Insurance, Noncurrent Stockholders' Equity Attributable to Parent Liabilities and Equity Revenues Cost of Services Operating Expenses Operating Income (Loss) Interest Expense Income (Loss) from Continuing Operations before Income Taxes, Domestic Income Tax Expense (Benefit) Income (Loss) from Continuing Operations Attributable to Parent Net Income (Loss) Attributable to Parent Income (Loss) from Continuing Operations, Per Diluted Share Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Earnings Per Share, Diluted Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Other Operating Assets Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Cash Provided by (Used in) Operating Activities Payments to Acquire Property, Plant, and Equipment Payments to Acquire Mining Assets Payments to Acquire and Develop Real Estate Payments to Acquire Interest in Joint Venture Increase (Decrease) in Notes Receivables Net Cash Provided by (Used in) Investing Activities Repayments of Long-term Debt Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]