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Note 15 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018
Balance | $ 32,996,163 | $ 33,489,207 | $ 33,790,735 | $ 35,184,039 | $ 33,489,207 | $ 35,184,039
Share-based compensation expense | 171,975 | 133,845 | 145,789 | 138,461 |  |
Issuance of common stock upon exercise of stock options, net (in shares) |  |  |  |  | 28,282 |
Issuance of common stock upon exercise of stock options, net | 42,644 | 2,528 | 26,200 | 159,518 |  |
Issuance of common stock upon vesting of restricted stock units | 2 |  |  |  |  |
Stock buyback | (550,000) | (1,621,022) |  |  |  |
Other comprehensive loss | (69,091) | (54,335) | (4,482) | (8,031) |  |
Net income (loss) | 1,178,850 | 1,045,940 | 460,908 | (1,683,252) | $ 2,224,790 | (1,222,344)
Balance | $ 33,770,543 | $ 32,996,163 | $ 34,419,150 | $ 33,790,735 | $ 33,770,543 | $ 34,419,150
Common Stock [Member] |  |  |  |  |  |
Balance (in shares) | 32,589,321 | 33,176,146 | 32,249,288 | 32,158,436 | 33,176,146 | 32,158,436
Balance | $ 326 | $ 332 | $ 322 | $ 322 | $ 332 | $ 322
Share-based compensation expense |  |  |  |  |  |
Issuance of common stock upon exercise of stock options, net (in shares) | 26,682 | 1,600 | 20,000 | 90,852 |  |
Issuance of common stock upon exercise of stock options, net |  |  |  |  |  |
Issuance of common stock upon vesting of restricted stock units | $ 2 |  |  |  |  |
Stock buyback (in shares) | (200,000) | (588,425) |  |  |  |
Stock buyback | $ (2) | $ (6) |  |  |  |
Other comprehensive loss |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |
Issuance of common stock upon vesting of restricted stock units (in shares) | 156,115 |  | 125,000 |  |  |
Balance (in shares) | 32,572,118 | 32,589,321 | 32,394,288 | 32,249,288 | 32,572,118 | 32,394,288
Balance | $ 326 | $ 326 | $ 322 | $ 322 | $ 326 | $ 322
Additional Paid-in Capital [Member] |  |  |  |  |  |
Balance | 88,766,502 | 90,251,145 | 88,254,818 | 87,956,839 | 90,251,145 | 87,956,839
Share-based compensation expense | 171,975 | 133,845 | 145,789 | 138,461 |  |
Issuance of common stock upon exercise of stock options, net | 42,644 | 2,528 | 26,200 | 159,518 |  |
Issuance of common stock upon vesting of restricted stock units |  |  |  |  |  |
Stock buyback | (549,998) | (1,621,016) |  |  |  |
Other comprehensive loss |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |
Balance | 88,431,123 | 88,766,502 | 88,426,807 | 88,254,818 | 88,431,123 | 88,426,807
Retained Earnings [Member] |  |  |  |  |  |
Balance | (55,470,955) | (56,516,895) | (54,455,105) | (52,771,853) | (56,516,895) | (52,771,853)
Share-based compensation expense |  |  |  |  |  |
Issuance of common stock upon exercise of stock options, net |  |  |  |  |  |
Issuance of common stock upon vesting of restricted stock units |  |  |  |  |  |
Stock buyback |  |  |  |  |  |
Other comprehensive loss |  |  |  |  |  |
Net income (loss) | 1,178,850 | 1,045,940 | 460,908 | (1,683,252) |  |
Balance | (54,292,105) | (55,470,955) | (53,994,197) | (54,455,105) | (54,292,105) | (53,994,197)
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Balance | (299,710) | (245,375) | (9,300) | (1,269) | (245,375) | (1,269)
Share-based compensation expense |  |  |  |  |  |
Issuance of common stock upon exercise of stock options, net |  |  |  |  |  |
Issuance of common stock upon vesting of restricted stock units |  |  |  |  |  |
Stock buyback |  |  |  |  |  |
Other comprehensive loss | (69,091) | (54,335) | (4,482) | (8,031) |  |
Net income (loss) |  |  |  |  |  |
Balance | $ (368,801) | $ (299,710) | $ (13,782) | $ (9,300) | $ (368,801) | $ (13,782)

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