Note 1 - Summary of Significant Accounting Policies - Amortization Expense Classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized contract cost	$ 3,242	$ 2,908	$ 2,483
Direct Expenses [Member]
Capitalized contract cost	272	34	83
Selling, General and Administrative Expenses [Member]
Capitalized contract cost	$ 2,970	$ 2,874	$ 2,400