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Note K - Derivatives and Hedging (Details Textual)
€ in Millions, SFr in Millions
3 Months Ended 12 Months Ended
Aug. 18, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
EUR (€)
Sep. 30, 2021
CHF (SFr)
Accumulated Other Comprehensive Income (Loss) Cumulative Cash Flow Hedges, Gain (Loss)   $ 1,200,000        
Deferred Tax Assets, Derivative Instruments   300,000        
Derivative Liability, Noncurrent   0   $ 4,000    
Derivative Liability, Current   74,000   814,000    
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.29%          
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member]            
Debt Instrument, Face Amount $ 10,000,000.0          
Wells Fargo Bank, N.A. [Member] | Credit Agreement [Member] | Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.80%          
Reclassification out of Accumulated Other Comprehensive Income [Member]            
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months   800,000        
Cash Flow Hedging [Member]            
OCI, before Reclassifications, before Tax, Attributable to Parent   1,400,000 $ (2,100,000)      
Cash Flow Hedging [Member] | Sales [Member]            
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax   100,000 $ 600,000 600,000    
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]            
Derivative, Notional Amount   5,800,000       SFr 5.3
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]            
Derivative, Notional Amount   67,200,000     € 56.3  
Derivative Asset, Current   1,200,000        
Derivative Assets, Noncurrent, Total   500,000        
Derivative Liability, Noncurrent       $ 4,000    
Derivative Liability, Current   $ 100,000        
Interest Rate Swap [Member]            
Derivative, Fixed Interest Rate 2.40%