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Note 14 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Balances |  |  | $ 35,184,039 |
Share-based compensation expense |  |  | $ 284,250 |
Issuance of common stock upon exercise of stock options, net (in shares) |  |  | 110,852 |
Issuance of common stock upon exercise of stock options, net |  |  | $ 185,718 |
Issuance of common stock upon vesting of restricted stock units |  |  |  |
Other comprehensive loss |  |  | (12,513) |
Net (loss) | $ 460,908 | $ 298,350 | (1,222,344) | $ (514,329)
Balances | $ 34,419,150 |  | $ 34,419,150 |
Common Stock [Member] |  |  |  |
Balances (in shares) |  |  | 32,158,436 |
Balances |  |  | $ 322 |
Issuance of common stock upon exercise of stock options, net (in shares) |  |  | 110,852 |
Issuance of common stock upon vesting of restricted stock units (in shares) |  |  | 125,000 |
Issuance of common stock upon vesting of restricted stock units |  |  |  |
Balances (in shares) | 32,394,288 |  | 32,394,288 |
Balances | $ 322 |  | $ 322 |
Additional Paid-in Capital [Member] |  |  |  |
Balances |  |  | 87,956,839 |
Share-based compensation expense |  |  | 284,250 |
Issuance of common stock upon exercise of stock options, net |  |  | 185,718 |
Issuance of common stock upon vesting of restricted stock units |  |  |  |
Balances | 88,426,807 |  | 88,426,807 |
Retained Earnings [Member] |  |  |  |
Balances |  |  | (52,771,853) |
Issuance of common stock upon vesting of restricted stock units |  |  |  |
Net (loss) |  |  | (1,222,344) |
Balances | (53,994,197) |  | (53,994,197) |
AOCI Attributable to Parent [Member] |  |  |  |
Balances |  |  | (1,269) |
Issuance of common stock upon vesting of restricted stock units |  |  |  |
Other comprehensive loss |  |  | (12,513) |
Balances | $ (13,782) |  | $ (13,782) |

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