Note 7 - Shareholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total stock-based compensation expense	$ 105	$ 15	$ 320	$ 183
Cost of Sales [Member] \| Edge to Cloud [Member]
Total stock-based compensation expense	20	3	24	9
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	80	10	286	198
Research and Development Expense [Member]
Total stock-based compensation expense	$ 5	$ 2	$ 10	$ (24)

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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