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Note 4 - PistolStar, Inc. Acquisition (Details Textual) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 21, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Repayments of Notes Payable |  |  | $ 250,000 | $ 130,000 |
PistolStar [Member] |  |  |  |  |
Business Combination, Consideration Transferred, Total |  | $ 2,500,000 |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | 2,000,000.0 |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  | $ 500,000 |  |  |
PistolStar [Member] | Promissory Note [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% |  |  |
Debt Instrument, Number of Installments |  | 4 |  |  |
Debt Instrument, Term (Month) |  | 12 months |  |  |
Notes Payable, Total |  |  |  |  | $ 232,000
Repayments of Notes Payable | $ 250,000 |  |  |  |

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