Note 11 - Business Segment and Geographic Financial Data - Geographic Segment Financial Data (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Revenues	$ 6,485	$ 5,558	$ 12,565	$ 11,940
Assets	43,194		43,194		$ 47,179
UNITED STATES
Revenues	5,901	4,442	11,148	9,801
Assets	40,636		40,636		44,345
Non-US [Member]
Revenues	584	$ 1,116	1,417	$ 2,139
Assets	$ 2,558		$ 2,558		$ 2,834

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

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