Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

v3.20.4
Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Dec. 31, 2020
Dec. 02, 2020
Oct. 28, 2020
May 01, 2020
Mar. 31, 2020
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit   $ 22,000,000      
Maximum limit of credit facility   37,000,000      
Term period of agreement 1 year        
Interest rate description interest at either: (i) a rate equal to the bank’s prime rate; or (ii) a rate equal to LIBOR plus 1.75%.        
Debt instrument, description of variable rate basis LIBOR plus 1.75%        
Unused commitment fee for borrowing 0.375%        
Fee for outstanding letters of credit 0.75%        
Debt instrument, covenant description Under the new revolving credit facility, the Company covenants to maintain a maximum funded debt to EBITDA (as defined in the agreement) ratio of 3.5 to 1.0 and a minimum earnings before interest expense and income taxes to interest ratio of 4.0 to 1.0. The agreement also provides that the Company is permitted to pay dividends without limitation if it maintains a maximum funded debt to EBITDA ratio equal to or less than 2.0 to 1.0 and permits the Company to pay dividends in an amount equal to 25% of net income if it maintains a maximum funded debt to EBITDA ratio of greater than 2.0 to 1.0.  The Company was in compliance with all such provisions as of December 31, 2020.        
Maximum funded debt to EBITDA ratio 350.00%        
Minimum earnings before interest expense and income taxes to interest ratio 400.00%        
Percentage of net income to be paid as dividend if EBITDA ratio is greater than 2.0 to 1 25.00%        
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | Dividend Payment Covenant [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Maximum funded debt to EBITDA ratio 200.00%        
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 1.75%        
JPMorgan Chase Bank, N.A. [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit   $ 7,000,000      
HSBC Bank USA [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit     $ 15,000,000 $ 14,000,000  
HSBC Bank USA [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Fee for outstanding letters of credit 0.85%        
HSBC Bank USA [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Fee for outstanding letters of credit 0.75%        
JP Morgan Chase Bank, N.A. and HSBC Bank USA, N.A. [Member]          
Debt Instrument [Line Items]          
Line of credit         $ 21,672,000
JP Morgan Chase Bank, N.A. and HSBC Bank USA, N.A. [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Availability under the line of credit $ 15,000,000        
JP Morgan Chase Bank, N.A. and HSBC Bank USA, N.A. [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Availability under the line of credit $ 4,900,000