Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended	19 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021
Asset Impairment Charges, Total	$ 0	$ 0
Contract with Customer, Liability, Current	0	209,000	$ 0
Share-based Payment Arrangement, Expense	185,000	375,000
Advertising Expense	27,000	32,000
Restricted Stock [Member] \| Incentive Plan 2020 [Member]
Share-based Payment Arrangement, Expense	$ 131,000	$ 6,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	15,140	8,912	24,052
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	17 years

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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-Name Accounting Standards Codification
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-SubTopic 35
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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