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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	$ (1,489,000)	$ (869,000)		$ (1,424,000)	$ (1,287,000)	$ (1,022,000,000)	$ (989,000)	$ (802,000)	$ (881,000,000)
Advertising Expense	102,000	27,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense	43,000	185,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 104,000	$ 131,000
The2004 Plan Member
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	19,600	0	5,009,750
Incentive Plan 2020 [Member] \| Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 104,000	$ 131,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	21,772	15,140
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	17 years