Note 6 - Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Total stock-based compensation expense	$ 154	$ 184	$ 233	$ 298
Cost of Sales [Member] | Edge to Cloud [Member]
Total stock-based compensation expense	1	4	5	13
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	152	178	226	279
Research and Development Expense [Member]
Total stock-based compensation expense	$ 1	$ 2	$ 2	$ 6