Note 7 - Selected Balance Sheet Accounts (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounts Receivable [Member] | Dealer and Manufacturers Concentration Risk [Member] | Urban Science Applications, Carat Detroit, Ford Direct and Autodata Solutions [Member]
Concentration Risk, Percentage	53.00%	59.00%
Accounts Receivable, Sale	$ 5.8	$ 8.3
Revenue Benchmark [Member] | Dealer and Manufacturers Concentration Risk [Member] | Urban Science Applications, Carat Detroit, Ford Direct and Autodata Solutions [Member]
Concentration Risk, Percentage	30.00%	41.00%
Operating Expense [Member]
Depreciation, Nonproduction	$ 0.3	$ 0.4