Note 6 - Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total stock-based compensation expense	$ 184	$ 218	$ 298	$ 596
Cost of Sales [Member] | Edge to Cloud [Member]
Total stock-based compensation expense	4	6	13	30
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	178	188	279	515
Research and Development Expense [Member]
Total stock-based compensation expense	$ 2	$ 24	$ 6	$ 51