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Note 15 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 08, 2022 | Jun. 18, 2021 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
Preferred Stock, Shares Authorized (in shares) |  |  | 5,000,000 |  |  |  | 5,000,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 1 |  |  |  | $ 1 |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | $ 600,004 |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 83,699 |  | $ 41,123 |  | $ 193,396 |  | $ 182,271
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total |  |  | $ 18,006 | 22,020 | $ 5,505 | $ 7,510 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  |  | 0 |  | 0 |  | 0 |  | 0
Class of Warrant or Right, Issued During Period (in shares) |  |  | 0 |  | 0 |  | 0 |  | 0
Common Stock [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | $ 27 |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  | 26,006 |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  | 1,250 | 274,250 | 1,250 | 1,250 |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares) |  |  | 1,250 |  | 1,250 |  |  |  |
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares) |  |  | 9,117 | 9,382 | 1,748 | 2,091 |  |  |
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total |  |  | $ 1 | $ 1 | $ 0 | $ 0 |  |  |
Common Stock [Member] | Director [Member] |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares) |  |  | 9,117 |  | 1,748 |  | 18,499 |  | 3,839
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total |  |  | $ 18,006 |  | $ 5,505 |  | $ 40,026 |  | $ 13,015
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 51,204 |  | $ 16,346 |  | $ 91,044 |  | $ 33,721
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  |  |  |  |  | 275,500 |  | 2,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value |  |  |  |  |  |  | $ 592,075 |  | $ 8,425
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares) |  |  |  |  |  |  | 1,250 |  | 1,250
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 789,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  | 85.00% |  |  |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  |  |  |  |  |  | 26,006 | 19,484 |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  | $ 8,314 | $ 10,680 |
Swivel Secure Europe [Member] |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | 269,060 |  |  |  |  |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date | $ 89,687 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 600,004 |  |  |  |  |  |  |  |
Business Acquisition, Share Price (in dollars per share) | $ 2.23 |  |  |  |  |  |  |  |

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