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Note 12 - Leases (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Oct. 01, 2019
Jan. 01, 2019
Increase in Lease Liability with 10% Increase in Index $ 19      
Operating Lease, Liability, Total 7,166   $ 7,815  
Operating Lease, Right-of-Use Asset $ 5,285 5,824  
Operating Lease, Weighted Average Remaining Lease Term (Year) 7 years 255 days      
Operating Lease, Weighted Average Discount Rate, Percent 4.13%      
Operating Lease, Expense $ 902 887    
Short-term Lease, Cost $ 0 $ 0    
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Liability, Total     7,815 $ 7,815
Operating Lease, Right-of-Use Asset     $ 5,824 $ 5,824