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Note 10 - Derivative Financial Instruments - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2022
Jun. 30, 2021
Notional Amount  
Fixed Rate  
Fair Value, Liability $ (6,550) $ (3,096)
Fair Value, Liability 6,550 3,096
Interest Rate Swap Effective May 24, 2017 Number One [Member]    
Notional Amount $ 25,000  
Fixed Rate 1.88%  
Maturity Apr. 24, 2022  
Fair Value, Liability $ (32) (374)
Fair Value, Liability 32 374
Interest Rate Swap Effective August 6, 2018 [Member]    
Notional Amount $ 25,000  
Fixed Rate 2.83%  
Maturity Aug. 06, 2023  
Fair Value, Liability $ (299) (1,401)
Fair Value, Liability 299 1,401
Interest Rate Swap Effective March 23, 2020 [Member]    
Notional Amount $ 100,000  
Fixed Rate 0.91%  
Maturity Mar. 23, 2025  
Fair Value, Liability $ 4,540 (907)
Fair Value, Liability (4,540) 907
Interest Rate Swap Effective April 24, 2020 [Member]    
Notional Amount $ 25,000  
Fixed Rate 0.88%  
Maturity Apr. 24, 2025  
Fair Value, Liability $ 1,203 (192)
Fair Value, Liability (1,203) 192
Interest Rate Swap Effective May 24, 2020 [Member]    
Notional Amount $ 25,000  
Fixed Rate 0.91%  
Maturity Mar. 24, 2025  
Fair Value, Liability $ 1,138 (222)
Fair Value, Liability $ (1,138) $ 222