Note 2 - Discontinued Operations (Details Textual) - Transport Financial Services [Member] - Discontinued Operations, Held-for-sale [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 08, 2020
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	$ 0	$ 86,620		$ 103,300
Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Gross				108,700
Disposal Group, Including Discontinued Operation, Allowance				5,400
Disposal Group, Including Discontinued Operation, Contingent Liabilities	44,151	0
Disposal Group Including Discontinued Operation, Total Indemnification				$ 45,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations	11,700
Disposal Group, Including Discontinued Operation, Consideration Returned upon Settlement	28,100	28,100	$ 17,300
Cash Provided by (Used in) Investing Activities, Discontinued Operations	108,400	0	0
Cash Provided by (Used in) Financing Activities, Discontinued Operations	0	$ 0	$ 0
Minimum [Member]
Disposal Group Including Discontinued Operation, Total Indemnification	44,200
Maximum [Member]
Disposal Group Including Discontinued Operation, Total Indemnification	$ 45,000