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Note 16 - Stockholders' Equity (Tables) | 6 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule of Stockholders Equity [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Additional |  |  |  |  |  |  | Other |  |  | Total |
|  | Common Stock |  |  | Paid-in |  |  | Accumulated |  |  | Comprehensive |  |  | Stockholders' |
|  | Shares |  |  | Amount |  |  | Capital |  |  | Deficit |  |  | Loss |  |  | Equity |
Balance at September 30, 2019 |  |  | 32,949,987 |  |  | $ | 330 |  |  | $ | 89,571,641 |  |  | $ | (53,731,903 | ) |  | $ | (458,719 | ) |  | $ | 35,381,349 |
Share-based compensation expense |  |  | - |  |  |  | - |  |  |  | 158,327 |  |  |  | - |  |  |  | - |  |  |  | 158,327 |
Issuance of common stock upon exercise of stock options, net |  |  | 83,343 |  |  |  | 1 |  |  |  | 144,213 |  |  |  | - |  |  |  | - |  |  |  | 144,214 |
Issuance of common stock upon vesting of restricted stock units |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Other comprehensive income |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 85,314 |  |  |  | 85,314 |
Net income |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 620,327 |  |  |  | - |  |  |  | 620,327 |
Balance at December 31, 2019 |  |  | 33,033,330 |  |  | $ | 331 |  |  | $ | 89,874,181 |  |  | $ | (53,111,576 | ) |  | $ | (373,405 | ) |  | $ | 36,389,531 |
Share-based compensation expense |  |  | - |  |  |  | - |  |  |  | 295,290 |  |  |  | - |  |  |  | - |  |  |  | 295,290 |
Issuance of common stock upon exercise of stock options, net |  |  | 56,861 |  |  |  | - |  |  |  | 113,833 |  |  |  | - |  |  |  | - |  |  |  | 113,833 |
Issuance of common stock upon vesting of restricted stock units |  |  | 198,106 |  |  |  | 2 |  |  |  | (2 | ) |  |  | - |  |  |  | - |  |  |  | - |
Shares retained for payment of taxes in connection with net share settlement of restricted stock units |  |  | (13,063 | ) |  |  | - |  |  |  | (41,410 | ) |  |  | - |  |  |  | - |  |  |  | (41,410 | )
Stock buyback |  |  | (156,505 | ) |  |  | (2 | ) |  |  | (398,254 | ) |  |  |  |  |  |  |  |  |  |  | (398,256 | )
Other comprehensive loss |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (69,352 | ) |  |  | (69,352 | )
Net income |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 301,575 |  |  |  | - |  |  |  | 301,575 |
Balance at March 31, 2020 |  |  | 33,118,729 |  |  | $ | 331 |  |  | $ | 89,843,638 |  |  | $ | (52,810,001 | ) |  | $ | (442,757 | ) |  | $ | 36,591,211 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Additional |  |  |  |  |  |  | Other |  |  | Total |
|  | Common Stock |  |  | Paid-in |  |  | Accumulated |  |  | Comprehensive |  |  | Stockholders' |
|  | Shares |  |  | Amount |  |  | Capital |  |  | Deficit |  |  | Loss |  |  | Equity |
Balance at September 30, 2018 |  |  | 33,176,146 |  |  | $ | 332 |  |  | $ | 90,251,145 |  |  | $ | (56,516,895 | ) |  | $ | (245,375 | ) |  | $ | 33,489,207 |
Share-based compensation expense |  |  | - |  |  |  | - |  |  |  | 133,845 |  |  |  | - |  |  |  | - |  |  |  | 133,845 |
Issuance of common stock upon exercise of stock options, net |  |  | 1,600 |  |  |  | - |  |  |  | 2,528 |  |  |  | - |  |  |  | - |  |  |  | 2,528 |
Issuance of common stock upon vesting of restricted stock units |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Stock buyback |  |  | (588,425 | ) |  |  | (6 | ) |  |  | (1,621,016 | ) |  |  | - |  |  |  | - |  |  |  | (1,621,022 | )
Other comprehensive loss |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (54,335 | ) |  |  | (54,335 | )
Net income |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,045,940 |  |  |  | - |  |  |  | 1,045,940 |
Balance at December 31, 2018 |  |  | 32,589,321 |  |  | $ | 326 |  |  | $ | 88,766,502 |  |  | $ | (55,470,955 | ) |  | $ | (299,710 | ) |  | $ | 32,996,163 |
Share-based compensation expense |  |  | - |  |  |  | - |  |  |  | 171,977 |  |  |  | - |  |  |  | - |  |  |  | 171,977 |
Issuance of common stock upon exercise of stock options, net |  |  | 26,682 |  |  |  | - |  |  |  | 42,644 |  |  |  | - |  |  |  | - |  |  |  | 42,644 |
Issuance of common stock upon vesting of restricted stock units |  |  | 156,115 |  |  |  | 2 |  |  |  | (2 | ) |  |  | - |  |  |  | - |  |  |  | - |
Stock buyback |  |  | (200,000 | ) |  |  | (2 | ) |  |  | (549,998 | ) |  |  | - |  |  |  |  |  |  |  | (550,000 | )
Other comprehensive loss |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (69,091 | ) |  |  | (69,091 | )
Net income |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,178,850 |  |  |  | - |  |  |  | 1,178,850 |
Balance at March 31, 2019 |  |  | 32,572,118 |  |  | $ | 326 |  |  | $ | 88,431,123 |  |  | $ | (54,292,105 | ) |  | $ | (368,801 | ) |  | $ | 33,770,543 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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