Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2020	Dec. 31, 2022
Accounts Receivable, after Allowance for Credit Loss	$ 4,894,222	$ 6,545,000		$ 6,973,000
Accounts Receivable, Allowance for Credit Loss, Current	35,000	35,000
Inventory Valuation Reserves	416,000	$ 292,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross		46,400
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,499,000)	$ (1,437,000)
Advertising Expense	65,000	60,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	59,000	25,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 404,000	$ 145,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	29,675	227,000
The2004 Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross	0	46,400	5,009,750
Incentive Plan 2020 [Member] | Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 404,000	$ 145,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	29,675	227,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	17 years