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Note 3 - Summary of Significant Accounting Policies (Details Textual) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 27, 2020 USD ($) | Sep. 30, 2020 shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Number of Operating Segments |  |  | 2 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  | $ 10,000 | $ 10,000
Proceeds from Notes Payable, Total |  |  | $ 276,180 |  |
Options and Warrants [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  | 7,477,171 | 5,004,415 |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |
Proceeds from Notes Payable, Total | $ 276,000 |  |  |  |
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 2 years |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 7 years |  |

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