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Note 16 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) 583,019 406,151  
Gross Proceeds from Stock Options Exercised $ 1,136 $ 757  
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) 198,106 156,115  
Preferred Stock, Shares Authorized (in shares) 5,000,000 5,000,000  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.00001 $ 0.00001  
Preferred Stock, Shares Outstanding, Ending Balance (in shares) 0 0  
Stock Repurchased During Period, Value $ 398 $ 2,171  
Share Buyback Program [Member]      
Stock Repurchase Program, Authorized Amount     $ 5,000
Stock Repurchased and Retired During Period, Shares (in shares) 156,505 788,425  
Stock Repurchased During Period, Value $ 398 $ 2,171