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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 |  |

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