Note 11 - Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total stock-based compensation expense	$ 674	$ 812
Per basic share (in dollars per share)	$ 0.04	$ 0.06
Per diluted share (in dollars per share)	$ 0.04	$ 0.06
Cost of Sales [Member] | Edge to Cloud [Member]
Total stock-based compensation expense	$ 35	$ 79
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	625	735
Research and Development Expense [Member]
Total stock-based compensation expense	$ 14	$ (2)