Note 14 - Stock Option Plans - Stock-based Compensation Allocation to Operating Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allocated share based compensation expense	$ 2,876	$ 2,574	$ 1,457
Network Expenses [Member]
Allocated share based compensation expense	307	223	110
Sales and Marketing Expense [Member]
Allocated share based compensation expense	1,251	1,025	573
Technical Operations and Development [Member]
Allocated share based compensation expense	596	636	360
General and Administrative Expense [Member]
Allocated share based compensation expense	$ 722	$ 690	$ 414