Note 1 - Summary of Significant Accounting Policies - Amortization Expense Classification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Capitalized contract cost	$ 636	$ 736	$ 2,073	$ 2,538
Direct Expenses [Member]
Capitalized contract cost	40	43	113	221
Selling, General and Administrative Expenses [Member]
Capitalized contract cost	$ 596	$ 693	$ 1,960	$ 2,317