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Debt (Details) - USD ($)
6 Months Ended
Sep. 30, 2021
May 31, 2021
Mar. 31, 2021
Amended Credit Facility [Abstract]      
Cash $ 17,911,000   $ 15,523,000
Summarized information about the term loan [Abstract]      
Less current portion of Term Loans (3,670,000)   (3,678,000)
Long-term portion of Term Loans 14,877,000   $ 16,786,000
Revolving Facility [Member]      
Amended Credit Facility [Abstract]      
Credit for cash $ 6,000,000    
Interest rate at end of period 2.84%   2.62%
Revolving Facility [Member] | Letters of Credit [Member]      
Amended Credit Facility [Abstract]      
Outstanding balance under revolving loan $ 6,694,000    
Term Loans [Member]      
Amended Credit Facility [Abstract]      
Quarterly principal payments $ 937,500    
Interest rate at end of period 2.84%   2.62%
Summarized information about the term loan [Abstract]      
Principal amount of Term Loans $ 18,750,000   $ 20,625,000
Unamortized financing fees (203,000)   (161,000)
Net carrying amount of Term Loans 18,547,000   20,464,000
Less current portion of Term Loans (3,670,000)   (3,678,000)
Long-term portion of Term Loans 14,877,000   16,786,000
Future repayments of the Term Loan, by fiscal year [Abstract]      
2022 - remaining six months 1,875,000    
2023 3,750,000    
2024 3,750,000    
2025 3,750,000    
2026 3,750,000    
Thereafter 1,875,000    
Total payments 18,750,000   20,625,000
Credit Facility [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity $ 268,620,000    
Debt instrument, maturity date Jun. 05, 2023    
Credit Facility [Member] | Minimum [Member]      
Amended Credit Facility [Abstract]      
Facility fee on total leverage ratio 0.375%    
Credit Facility [Member] | Maximum [Member]      
Amended Credit Facility [Abstract]      
Dividend payments and share repurchases, annual maximum amount permitted $ 29,430,000    
Facility fee on total leverage ratio 0.50%    
Credit Facility [Member] | LIBOR [Member]      
Amended Credit Facility [Abstract]      
Reference interest rate under option 1, floor 2.25%    
Interest rate over LIBOR rate under option 1 2.50%    
Interest rate above base rate under option 2 2.75%    
Credit Facility [Member] | Reference Rate [Member]      
Amended Credit Facility [Abstract]      
Reference interest rate under option 1, floor 1.25%    
Interest rate over LIBOR rate under option 1 1.50%    
Interest rate above base rate under option 2 1.75%    
Credit Facility [Member] | Revolving Facility [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity $ 238,620,000    
Outstanding balance under revolving loan 120,000,000   $ 84,000,000
Amount available under revolving facility 90,935,000    
Credit Facility [Member] | Revolving Facility [Member] | Canadian Borrowers [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity 24,000,000    
Credit Facility [Member] | Revolving Facility [Member] | Letters of Credit [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity 20,000,000    
Credit Facility [Member] | Term Loans [Member]      
Amended Credit Facility [Abstract]      
Maximum borrowing capacity $ 30,000,000    
Third Amended Credit Facility [Member]      
Amended Credit Facility [Abstract]      
Debt instrument, maturity date May 28, 2026    
Debt issuance costs   $ 1,102,000