Note 3 - Revenue - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 6,368	$ 5,218	$ 11,903	$ 10,251
Transferred at Point in Time [Member]
Revenues	4,402	4,995	8,096	9,655
Transferred over Time [Member]
Revenues	$ 1,966	$ 223	$ 3,807	$ 596

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details