Note 1 - Summary of Significant Accounting Policies - Amortization Expense Classification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Capitalized contract cost	$ 748	$ 614	$ 2,097	$ 1,888
Direct Expenses [Member]
Capitalized contract cost	10	13	26	73
Selling, General and Administrative Expenses [Member]
Capitalized contract cost	$ 738	$ 601	$ 2,072	$ 1,815