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Note 16 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | 140,204 | 28,282 |  |
Gross Proceeds from Stock Options Exercised | $ 258,047 | $ 45,172 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) | 185,043 | 156,115 |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0 | $ 0 |  |
Share Buyback Program [Member] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 5,000,000 | $ 4,000,000
Stock Repurchased and Retired During Period, Shares (in shares) | 156,505 | 788,425 |  |
Stock Repurchased During Period, Value | $ 398,256 | $ 2,171,022 |  |

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