Note 1 - Summary of Significant Accounting Policies - Amortization Expense Classification (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Capitalized contract cost	$ 641	$ 639	$ 1,328	$ 1,254
Direct Expenses [Member]
Capitalized contract cost	13	29	19	59
Selling, General and Administrative Expenses [Member]
Capitalized contract cost	$ 628	$ 610	$ 1,309	$ 1,195