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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00%
Deferred Tax Liabilities, Difference in Cumulative Book Value of Depreciation of Property and Equipment | $ 65,000 |  |
Deferred Tax Assets, Valuation Allowance, Total | 242 | $ 385 |
Liability for Uncertainty in Income Taxes, Current | 1,000 | 900 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 100 | 100 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 0 | 800 | $ 100
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 900 | 900 |
Tax Credit Carryforward, Amount | 10,900 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total | 92,200 |  |
Tax Credit Carryforward, Amount | $ 500 |  |
Domestic Tax Authority [Member] |  |  |
Open Tax Year | 2015 |  |
Operating Loss Carryforwards, Total | $ 101,900 |  |
Operating Loss Carryforwards, Not Subject to Expiration | 3,900 |  |
Charitable Contributions Carryforward | 3,100 |  |
Operating Loss Carryforwards, After Charitable Contributions, Not Subject to Expiration | 7,000 |  |
Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] | State and Local Jurisdiction [Member] |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 300 |  |
Transport Financial Services [Member] |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation, Total | $ 9,500 | $ 1,100 | $ 600

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