Note 7 - Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Total stock-based compensation expense	$ 281	$ 188	$ 601	$ 371
Cost of Sales [Member] \| Edge to Cloud [Member]
Total stock-based compensation expense	26	1	50	10
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	250	175	536	373
Research and Development Expense [Member]
Total stock-based compensation expense	$ 5	$ 12	$ 15	$ (12)

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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