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Note 2 - Accounting Policies - Revenues Allocations to Reportable Segments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 19,746,000	$ 17,628,000
Domestic Segment [Member]
Revenues	16,655,000	14,719,000
Foreign Segment [Member]
Revenues	$ 3,091,000	$ 2,909,000

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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