Note 11 - Financial Information About Geographic Areas - Consolidated Net Sales and Long-lived Asset Information by Geographic Area (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Revenues	$ 18,674,000	$ 16,672,000	$ 33,259,000	$ 30,494,000
Reportable Geographical Components [Member]
Long-lived assets	7,975,000		7,975,000		$ 8,234,000
UNITED STATES \| Reportable Geographical Components [Member]
Revenues	18,472,000	16,470,000	32,916,000	30,116,000
Long-lived assets	6,635,000		6,635,000		6,953,000
Non-US [Member] \| Reportable Geographical Components [Member]
Revenues	202,000	$ 202,000	343,000	$ 378,000
Long-lived assets	$ 1,340,000		$ 1,340,000		$ 1,281,000

Amount, including 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