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Note 13 - Stockholders' Equity
 12 Months Ended
Sep. 30, 2016
Notes to Financial Statements  
Stockholders' Equity Note Disclosure [Text Block]
13. STOCKHOLDERS’ EQUITY
 
Common Stock Activity
 
During the year ended September 30, 2016, the Company issued 1,250 shares of common stock and obtained gross proceeds of $2,200 in connection with the exercise of stock options. During the year ended September 30, 2015, the Company issued 396,042 shares of common stock and obtained gross proceeds of $504,371 in connection with the exercise of stock options.
 
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, 2016 or 2015.
 
Stock Purchase Warrants
 
 
At September 30, 2015, the Company had 1,627,945 shares purchasable under outstanding warrants at an exercise price of $2.67. These warrants expired on February 4, 2016.
 
Share Buyback Program
 
The Board of Directors approved a share buyback program in 2013 under which the Company was authorized to repurchase up to $4 million of its outstanding common shares. This program expired on December 31, 2015 and in December 2015, the Board of Directors approved a new buyback program for calendar year 2016 under which the Company is authorized to repurchase up to $4 million of its outstanding common shares. During the year ended September 30, 2016, 1,099,608 shares were repurchased for $1,748,456 and in the year ended September 30, 2015, 734,070 shares were repurchased for $1,564,666. At September 30, 2016, all repurchased shares were retired.