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Note 4 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Cash, Uninsured Amount | $ 2,900,000 |  | $ 3,700,000
Impairment of Intangible Assets, Finite-lived | 0 | $ 0 |
Goodwill, Impairment Loss | 0 | $ 0 |
Long-term Debt, Total | $ 8,948,629 |  | $ 9,943,605
Open Tax Year | 2017 2018 2019 2020 |  |
Client Acquisition Costs [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 4 years |  | 4 years
Weighted Average [Member] |  |  |
Merchant Contracts, Term (Year) | 3 years |  |
Russia and Cayman Islands [Member] |  |  |
Cash, Uninsured Amount | $ 10,000 |  | $ 43,000

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