Note 6 - Valuation Accounts - Allowance for Accounts Receivable (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Balance	$ 1,605
Current period provision	2,404
Balance	1,590
Write offs against allowance, net of recoveries	(2,419)
Commercial Vehicle Receivables [Member]
Balance	172
Current period provision	(96)
Balance	76
Manufacturers' Receivables [Member]
Balance	136
Current period provision	1,158
Balance	419
Write offs against allowance, net of recoveries	(875)
Leasing, Parts and Service Receivables [Member]
Balance	1,278
Current period provision	1,335
Balance	1,069
Write offs against allowance, net of recoveries	(1,544)
Other Receivables [Member]
Balance	19
Current period provision	7
Balance	$ 26