Note 2 - Revenue Recognition - Revenues Disaggregated by Geography (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 24,261	$ 22,550
UNITED STATES
Revenues	19,515	18,622
Americas, Excluding United States [Member]
Revenues	356	549
Europe [Member]
Revenues	1,894	1,656
Asia [Member]
Revenues	2,496	1,723
Non-US [Member]
Revenues	$ 4,746	$ 3,928

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details