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Note 15 - Stockholders' Equity	12 Months Ended
	Sep. 30, 2019
Notes to Financial Statements
Stockholders' Equity Note Disclosure [Text Block]	1 5 . STOCKHOLDERS’ EQUITY Common Stock Activity During the year ended September  30, 2019, the Company issued 406,151 shares of common stock and obtained gross proceeds of $756,513 in connection with the exercise of stock options. During the year ended September  30, 2018, the Company issued 1,179,456 shares of common stock and obtained gross proceeds of $2,434,887 in connection with the exercise of stock options. During the year ended September 30, 2019, the Company issued 156,115 of shares of common stock upon full vesting of RSUs. During the year ended September 30, 2018, the Company issued 125,000 of shares of common stock upon full vesting of RSUs. Preferred Stock The Company is authorized under its certificate of incorporation and bylaws to issue 5,000,000 shares of preferred stock, $0.00001 par value, without any further action by the stockholders. The board of directors has the authority to divide any and all shares of preferred stock into series and to fix and determine the relative rights and preferences of the preferred stock, such as the designation of series and the number of shares constituting such series, dividend rights, redemption and sinking fund provisions, liquidation and dissolution preferences, conversion or exchange rights and voting rights, if any. Issuance of preferred stock by the board of directors could result in such shares having dividend and or liquidation preferences senior to the rights of the holders of common stock and could dilute the voting rights of the holders of common stock. No shares of preferred stock were outstanding during the fiscal years ended September  30, 2019 or 2018. Share Buyback Program The Board of Directors approved a share buyback program in 2015 under which the Company was authorized to repurchase up to $4 million of its outstanding common shares. In December 2017, the Board of Directors extended the program through December 31, 2018. In December 2018, the Board of Directors approved a new share buyback program beginning January 1, 2019, under which the Company was authorized to repurchase up to $5 million of its outstanding common shares. The previous program expired on December 31, 2018. During the year ended September 30, 2019, 788,425 shares were repurchased for $2,171,022. During the year ended September 30, 2018, 286,746 shares were repurchased for $725,445. At September 30, 2019, all repurchased shares were retired.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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