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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Asset Impairment Charges, Total | $ 0 | $ 0 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 370,000 | 349,750 |  |
Share-based Payment Arrangement, Expense | $ 451,000 | $ 432,000 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |  |
Advertising Expense | $ 16,000 | $ 32,000 |  |
Assets, Total | 38,091,000 | $ 34,255,000 | [1] |
Accounting Standards Update 2014-09 [Member] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 0 |  |  |
Accounting Standards Update 2018-11 [Member] |  |  |  |
Assets, Total |  |  |  | $ 3,455,000
Minimum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |
Maximum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 17 years |  |  |
[1] | The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.

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