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

The term of merchant contracts.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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