Note 13 - Accounts Receivable and Allowance for Credit Losses - Allowance for Accounts Receivable (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Balance	$ 1,424
Current period provision	1,352
Write offs against allowance, net of recoveries	(1,097)
Balance	1,679
Write offs against allowance, net of recoveries	(1,097)
Commercial Vehicle Receivables [Member]
Balance	11
Current period provision	171
Write offs against allowance, net of recoveries	(11)
Balance	171
Write offs against allowance, net of recoveries	(11)
Manufacturers' Receivables [Member]
Balance	410
Current period provision	270
Write offs against allowance, net of recoveries	(443)
Balance	237
Write offs against allowance, net of recoveries	(443)
Leasing, Parts and Service Receivables [Member]
Balance	989
Current period provision	864
Write offs against allowance, net of recoveries	(641)
Balance	1,212
Write offs against allowance, net of recoveries	(641)
Other Receivables [Member]
Balance	14
Current period provision	47
Write offs against allowance, net of recoveries	(2)
Balance	59
Write offs against allowance, net of recoveries	$ (2)