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Long-Term Debt (Revolving Credit Facility) (Details)
Feb. 06, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Debt (Textual) [Abstract]      
Outstanding letters of credit totaling   $ 0  
Revolving credit facility   $ 3,719,000 $ 2,500,000
Wells Fargo Bank, National Association | Credit Agreement | Revolving credit facility      
Debt (Textual) [Abstract]      
Current borrowings under credit facility $ 15,000,000.0    
Maximum borrowing capacity under credit facility $ 20,000,000.0    
Minimum indebtedness ratio 1.10    
Interest charge $ 130,000    
Effective interest rate, percentage   3.63%  
Commitment fee percentage 0.25%    
Revolving credit facility   $ 3,719,000  
Additional borrowing capacity   $ 229,000  
Wells Fargo Bank, National Association | Credit Agreement | Letter of Credit      
Debt (Textual) [Abstract]      
Maximum borrowing capacity under credit facility $ 2,000,000.0    
Commitment fee percentage 3.00%    
Wells Fargo Bank, National Association | Credit Agreement | London Interbank Offered Rate (LIBOR) | Revolving credit facility      
Debt (Textual) [Abstract]      
Spread on basis rate (percentage) 3.00%