Note 12 - Accounts Receivable and Allowance for Credit Losses - Allowance for Accounts Receivable (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Balance	$ 1,424
Current period provision	2,188
Balance	1,262
Write offs against allowance, net of recoveries	(2,350)
Commercial Vehicle Receivables [Member]
Balance	11
Current period provision	96
Balance	107
Manufacturers' Receivables [Member]
Balance	410
Current period provision	895
Balance	174
Write offs against allowance, net of recoveries	(1,131)
Leasing, Parts and Service Receivables [Member]
Balance	989
Current period provision	1,182
Balance	966
Write offs against allowance, net of recoveries	(1,205)
Other Receivables [Member]
Balance	14
Current period provision	15
Balance	15
Write offs against allowance, net of recoveries	$ (14)