Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss, Current	$ 35,000	$ 45,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	46,400	19,600
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (1,437,000)	$ (1,489,000)
Advertising Expense	60,000	102,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	25,000	43,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 145,000	$ 104,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	227,000	21,772
The2004 Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	46,400	19,600	5,009,750
Incentive Plan 2020 [Member] \| Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 145,000	$ 104,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	227,000	21,772
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	17 years

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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