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Note 15 - Stock Based Compensation (Tables)
3 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Risk-free interest rate
   
0.24
%
Expected term (years)
   
6.25
 
Expected volatility
   
23.4
%
Dividend yield
   
0.00
%