Note 6 - Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total stock-based compensation expense	$ 40	$ 210	$ 115	$ 378
Cost of Sales [Member] | Edge to Cloud [Member]
Total stock-based compensation expense	4	9	10	24
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	34	181	100	327
Research and Development Expense [Member]
Total stock-based compensation expense	$ 2	$ 20	$ 5	$ 27