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Note 17 - Stockholders' Equity (Details Textual) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 20, 2020 | Jul. 23, 2020 USD ($) shares | Mar. 30, 2020 USD ($) $ / shares shares | Sep. 23, 2015 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Mar. 31, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares | Jun. 30, 2020 USD ($) shares | Mar. 31, 2020 shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares
Preferred Stock, Shares Authorized (in shares) |  |  |  |  | 5,000,000 |  |  |  |  |  | 5,000,000 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 1 |  |  |  |  |  | $ 1 |
Stock Issued During Period, Shares, Warrants Exercises (in shares) |  |  | 121,500 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 12.00 | $ 28.80 |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  | $ 1,458,000 |  |  |  |  |  |  |  | $ 0 | $ 5,594,795
Share-based Payment Arrangement, Expense | $ |  |  |  |  | $ 58,050 |  |  | $ 54,230 |  |  | $ 240,321 | $ 709,788
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ |  |  |  |  | $ 6,008 | $ 5,505 | $ 7,510 | $ 7,003 | $ 15,007 |  |  |
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 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 8,681 |  |  |  |  |  |  |  |
Dividends, Paid-in-kind, Total | $ |  |  |  | $ 41,688 | $ (0) |  |  | $ (0) |  |  | $ (0) | $ 112,686
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 4,264,312 | 31,440 | 87,500 |  |
Stock Issued During Period, Shares, Conversion of Warrant (in shares) |  |  |  |  |  |  |  | 795,538 |  | 121,500 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  |  |  | 3,750 | 1,250 | 1,250 | 38,250 |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares) |  |  |  |  |  | 1,250 |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  | 1,888 | 1,748 | 2,091 | 1,291 | 2,143 |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 1 | $ 1 |  |  |
Director [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  | 1,888 |  |  | 1,291 |  |  | 5,727 | 3,434
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ |  |  |  |  | $ 6,008 |  |  | $ 7,003 |  |  | $ 19,023 | $ 22,010
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  |  |  |  |  |  | 38,250 |  |  | 6,250 | 38,250
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  | 1,250 |
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 | $ |  |  |  |  |  |  |  |  |  |  | $ 18,456 |
Share-based Payment Arrangement, Expense | $ |  |  |  |  | $ 18,360 |  |  |  |  |  | $ 52,081 |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 512,500 |  |  |  |  |  |  |  |  |  |
Equity Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 283,038 |  |  |  |  |  |  |  |  |  |
Referral Fee Warrants [Member] | Investor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 94,655
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  | 15,625 |  |  |  | 15,625
Referral Fee Warrants [Member] | Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 12,921
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  | 3,125 |  |  |  | 3,125
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 5.20 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 48,078 |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ |  | $ 22,700,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 4,264,312 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Warrant (in shares) |  | 795,538 |  |  |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 8 |  |  |  |  |  |  |  |  |  |  |

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