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Note 17 - Subsequent Events (Details Textual) |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2021 USD ($) | Mar. 15, 2021 USD ($) ft² | Feb. 05, 2021 $ / shares shares | Jan. 06, 2021 USD ($) shares | Jan. 01, 2021 USD ($) ft² | Aug. 12, 2020 $ / shares shares | Jan. 06, 2020 USD ($) shares | Jan. 06, 2019 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  | $ 280,269 | $ 71,906
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) | shares |  |  |  |  |  | 27,051 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.46 |  |  |  |
Class of Warrant or Right, Number of Warrants Exercised (in shares) | shares |  |  |  |  |  | 60,000 |  |  |  |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Largest ACH Customer [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 1.12% |
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Largest ACH Customer [Member] | ACH and Complementary Service Revenue [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 15.00% |
Subsequent Event [Member] | Debit Arrangement to Finance Purchase of Output Solutions Sorter [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 165,996 |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Month) | 3 years |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Total | $ 4,901.79 |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | 4,901.88 |  |  |  |  |  |  |  |  |
Debt Instrument, Annual Periodic Payment | $ 58,821 |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) | shares |  |  | 19,795 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 5.88 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Warrants Exercised (in shares) | shares |  |  | 30,000 |  |  |  |  |  |  |
Subsequent Event [Member] | Austin, TX [Member] | Lease for Technology Organization [Member] |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract (Month) |  |  |  |  | 2 years 30 days |  |  |  |  |
Operating Leases, Area Leased (Square Foot) | ft² |  |  |  |  | 1,890 |  |  |  |  |
Operating Lease, Annual Expense |  |  |  |  | $ 55,755 |  |  |  |  |
Subsequent Event [Member] | San Antonio, TX [Member] | Incremental Space Leased [Member] |  |  |  |  |  |  |  |  |  |
Operating Leases, Area Leased (Square Foot) | ft² |  | 2,734 |  |  |  |  |  |  |  |
Subsequent Event [Member] | San Antonio, TX [Member] | Incremental Space Leased [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Operating Lease, Annual Expense |  | $ 56,047 |  |  |  |  |  |  |  |
Subsequent Event [Member] | San Antonio, TX [Member] | Incremental Space Leased [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Operating Lease, Annual Expense |  | $ 60,148 |  |  |  |  |  |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | shares |  |  |  |  |  |  | 11,860 | 11,860 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  | $ 20,636 | $ 21,822 |  |
Chief Financial Officer [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | shares |  |  |  | 11,860 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 38,545 |  |  |  |  |  |

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