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Note 15 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 406,151 | 1,179,456 |  |
Gross Proceeds from Stock Options Exercised | $ 756,513 | $ 2,434,887 |  |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.00001 | $ 0.00001 |  |
Preferred Stock, Shares Outstanding, Ending Balance | 0 | 0 |  |
Stock Repurchased During Period, Value | $ 2,171,022 | $ 725,445 |  |
Share Buyback Program [Member] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 5,000,000 | $ 4,000,000
Stock Repurchased and Retired During Period, Shares | 788,425 | 286,746 |  |
Stock Repurchased During Period, Value | $ 2,171,022 | $ 725,445 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 156,115 | 125,000 |  |

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