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FAIR VALUE OF FINANCIAL INSTRUMENTS: (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Fair value of assets and liabilities    
Assets of non-qualified retirement plan $ 17,035 $ 15,838
Fair value measurements on recurring basis | Estimate of Fair Value Measurement    
Fair value of assets and liabilities    
Assets of non-qualified retirement plan 17,035 15,838
Total assets 17,035 15,838
Fair value measurements on recurring basis | Estimate of Fair Value Measurement | Level 1    
Fair value of assets and liabilities    
Assets of non-qualified retirement plan 17,035 15,838
Total assets 17,035 15,838
Fair value measurements on recurring basis | Estimate of Fair Value Measurement | Level 2    
Fair value of assets and liabilities    
Assets of non-qualified retirement plan 0 0
Total assets 0 0
Fair value measurements on recurring basis | Estimate of Fair Value Measurement | Level 3    
Fair value of assets and liabilities    
Assets of non-qualified retirement plan 0 0
Total assets $ 0 $ 0