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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Deferred Tax Liabilities, Difference in Cumulative Book Value of Depreciation of Property and Equipment	$ 98.8
Liability for Uncertainty in Income Taxes, Current	0.4	$ 0.6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0.1	0.1
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 0.4	0.6
Open Tax Year	2019
Tax Credit Carryforward, Amount	$ 1.0
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount	0.4
Operating Loss Carryforwards	68.9
Transport Financial Services [Member]
Discontinued Operation, Tax Effect of Discontinued Operation	$ 0.2	$ 0.8

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Amount of deferred tax liability attributable to taxable temporary difference in cumulative book value of depreciation of property and equipment.

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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