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Note 16 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Balance | $ 35,381,349 | $ 33,489,207
Share-based compensation expense | $ 158,327 | $ 133,845
Issuance of common stock upon exercise of stock options, net (in shares) | 83,343 | 1,600
Issuance of common stock upon exercise of stock options, net | $ 144,214 | $ 2,528
Issuance of common stock upon vesting of restricted stock units |  |
Other comprehensive income (loss) | 85,314 | (54,335)
Net income | 620,327 | 1,045,940
Stock buyback |  | (1,621,022)
Balance | $ 36,389,531 | $ 32,996,163
Common Stock [Member] |  |
Balance (in shares) | 32,949,987 | 33,176,146
Balance | $ 330 | $ 332
Issuance of common stock upon exercise of stock options, net (in shares) | 83,343 | 1,600
Issuance of common stock upon exercise of stock options, net | $ 1 |
Issuance of common stock upon vesting of restricted stock units |  |
Other comprehensive income (loss) |  |
Net income |  |
Stock buyback (in shares) |  | (588,425)
Stock buyback |  | $ (6)
Balance (in shares) | 33,033,330 | 32,589,321
Balance | $ 331 | $ 326
Additional Paid-in Capital [Member] |  |
Balance | 89,571,641 | 90,251,145
Share-based compensation expense | 158,327 | 133,845
Issuance of common stock upon exercise of stock options, net | 144,213 | 2,528
Issuance of common stock upon vesting of restricted stock units |  |
Other comprehensive income (loss) |  |
Net income |  |
Stock buyback |  | (1,621,016)
Balance | 89,874,181 | 88,766,502
Retained Earnings [Member] |  |
Balance | (53,731,903) | (56,516,895)
Issuance of common stock upon vesting of restricted stock units |  |
Other comprehensive income (loss) |  |
Net income | 620,327 | 1,045,940
Stock buyback |  |
Balance | (53,111,576) | (55,470,955)
AOCI Attributable to Parent [Member] |  |
Balance | (458,719) | (245,375)
Issuance of common stock upon vesting of restricted stock units |  |
Other comprehensive income (loss) | 85,314 | (54,335)
Net income |  |
Stock buyback |  |
Balance | $ (373,405) | $ (299,710)

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