Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

v3.8.0.1
Long-Term Debt (Details)
6 Months Ended
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Apr. 30, 2013
USD ($)
Debt Instrument [Line Items]      
Debt issuance costs, net $ 363,000 $ 524,000  
Less current portion (20,250,000) (20,250,000)  
Long-term debt, noncurrent $ 50,262,000 60,226,000  
Maximum leverage ratio 2.75    
Payments of debt issuance costs     $ 341,000
Loans Payable      
Debt Instrument [Line Items]      
Debt issuance costs, net $ 363,000 524,000  
Variable Rate Term Loan, due April 2019, net of deferred debt issuance costs of $442 and $524 as of September 30, 2017 and March 31, 2017, respectively $ 70,512,000 80,476,000  
Debt Instrument, face amount   5,905,000  
Debt Instrument, interest rate, stated percentage 3.50%    
Secured Debt      
Debt Instrument [Line Items]      
Debt Instrument, face amount     135,000,000
Revolving credit facility      
Debt Instrument [Line Items]      
Debt instrument, interest rate, decrease (percentage) 0.25%    
Line of credit facility, decrease in periodic payment (as a percentage) 0.05%    
Annual commitment fee on unutilized commitments (as a percent) 0.30%    
Line of credit facility, commitment fee percentage 0.125%    
Outstanding borrowings $ 0    
Interest rate at period end (as a percent) 5.50%    
Capacity available under credit facility $ 56,018,000    
London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
One-Month Canadian Deposit Offered Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Canadian Deposit Offer Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.10%    
Minimum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
Maximum | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Through March 31, 2019 | Loans Payable      
Debt Instrument [Line Items]      
Repayments of Notes Payable $ 1,688,000    
Due in April 2019 | Loans Payable      
Debt Instrument [Line Items]      
Repayments of Notes Payable $ 40,500,000    
Interest Rate Swap | Revolving credit facility      
Debt Instrument [Line Items]      
Derivative, fixed interest rate 3.42%    
Interest payments, percent hedged 100.00%    
Revolving credit facility      
Debt Instrument [Line Items]      
Outstanding borrowings $ 0 $ 0  
Revolving credit facility | Line of Credit      
Debt Instrument [Line Items]      
Debt Instrument, face amount     $ 60,000,000