Note 12 - Accounts Receivable and Allowance for Credit Losses - Allowance for Accounts Receivable (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Balance	$ 1,605
Current period provision	454
Balance	1,423
Write offs against allowance, net of recoveries	(636)
Commercial Vehicle Receivables [Member]
Balance	172
Current period provision	5
Balance	177
Manufacturers' Receivables [Member]
Balance	136
Current period provision	266
Balance	146
Write offs against allowance, net of recoveries	(256)
Leasing, Parts and Service Receivables [Member]
Balance	1,278
Current period provision	181
Balance	1,082
Write offs against allowance, net of recoveries	(377)
Other Receivables [Member]
Balance	19
Current period provision	2
Balance	18
Write offs against allowance, net of recoveries	$ (3)