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Note 5 - Fair Value Measurements - Derivatives Asset and Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Foreign currency forward contract, asset $ 5,205
Foreign currency forward contract, unrealized loss (76)
Foreign currency forward contract, liability 5,281
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]    
Foreign currency forward contract, asset 5,205  
Foreign currency forward contract, unrealized loss (76)  
Foreign currency forward contract, liability $ 5,281