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FAIR VALUE OF FINANCIAL INSTRUMENTS: (Tables)
3 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of financial assets and liabilities measured at fair value
The following table details the fair value measurements within the fair value hierarchy of the Company's financial assets and liabilities at June 30, 2021 and March 31, 2021 (dollars in thousands):
 
June 30, 2021
Level 1Level 2Level 3Total
Other current assets:
Assets of non-qualified retirement plan$17,035 $— $— $17,035 
Total$17,035 $— $— $17,035 
March 31, 2021
Level 1Level 2Level 3Total
Other current assets:
Assets of non-qualified retirement plan$15,838 $— $— $15,838 
Total$15,838 $— $— $15,838