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Note 3 - Summary of Accounting Policies (Details Textual) |  | 12 Months Ended
--- | --- | ---
Apr. 20, 2018 | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.18 | $ 0.18
Restricted Cash and Cash Equivalents, Total |  | $ 110,000 | $ 55,000
Property, Plant and Equipment, Gross, Ending Balance |  | 216,000 | 171,000
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance |  | 162,000 | 160,000
Depreciation, Total |  | 14,386 | 25,956
Impairment of Long-Lived Assets Held-for-use |  | 0 | 0
Impairment of Intangible Assets (Excluding Goodwill), Total |  | 0 | 461,715
Intangible Assets, Net (Excluding Goodwill), Total |  | $ 192,000 | 234,000
Intangible Asset, Measurement Input |  | 0.485 |
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 93,000 | 158,000
Amortization of Intangible Assets, Total |  | 29,811 | 103,038
Warrant Liabilities |  | $ 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  | 0.00% |
Acueity intangible Assets [Member] |  |  |
Impairment of Intangible Assets (Excluding Goodwill), Total |  |  | 461,715
Intangible Assets, Net (Excluding Goodwill), Total |  |  | $ 0
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |
Finite-Lived Intangible Asset, Useful Life |  | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Vesting Term |  | 1 year |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Vesting Term |  | 4 years |
Reverse Stock Split [Member] |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 12 |  |

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