Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Asset Impairment Charges, Total	$ 0	$ 0
Contract with Customer, Liability, Current	$ 209,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	370,000
Share-based Payment Arrangement, Expense	$ 375,000	451,000
Advertising Expense	32,000	16,000
Assets, Total	68,802,000	38,091,000
Liabilities, Total	8,782,000	$ 4,864,000
Accounting Standards Update 2018-11 [Member]
Assets, Total			$ 3,455,000
Liabilities, Total			$ 3,455,000
Restricted Stock [Member] \| Incentive Plan 2020 [Member]
Share-based Payment Arrangement, Expense	$ 6,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	8,912
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
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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