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Note 13 - Stockholders' Equity (Details Textual) - USD ($)
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 233,333 1,250  
Proceeds from Stock Options Exercised $ 373,228 $ 2,200  
Incresase in Accounts Receivable, Stock Options Exercised $ 240,228    
Preferred Stock, Shares Authorized 5,000,000 5,000,000  
Preferred Stock, Par or Stated Value Per Share $ 0.00001 $ 0.00001  
Preferred Stock, Shares Outstanding 0 0  
Share Buyback Program [Member]      
Stock Repurchase Program, Authorized Amount     $ 4,000,000
Stock Repurchased and Retired During Period, Shares 0 1,099,608  
Stock Repurchased During Period, Value   $ 1,748,456  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 125,000 0