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Long-Term Debt - Additional Information (Details)
3 Months Ended 9 Months Ended
Feb. 06, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2019
USD ($)
Nov. 02, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Short-term borrowings   $ 58,695,000 $ 58,695,000     $ 0 $ 48,431,000
Long term debt excluding current portion   16,000 16,000     40,228,000 285,000
Long term debt           40,000,000  
Capital Lease Obligations              
Debt Instrument [Line Items]              
Current portion of long term debt   132,000 132,000     74,000 161,000
Long term debt excluding current portion   16,000 16,000     120,000 138,000
Long term debt   148,000 148,000     194,000 299,000
Financed Computer Equipment              
Debt Instrument [Line Items]              
Current portion of long term debt   173,000 173,000     154,000 152,000
Long term debt excluding current portion   0 0     108,000 147,000
Long term debt   173,000 173,000     262,000 299,000
Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt outstanding   $ 58,695,000 58,695,000     $ 40,000,000 $ 48,431,000
Minimum tangible net worth     $ 170,000,000        
Interest coverage ratio   1.05 3.50        
Interest rate   0.95% 0.95%        
Debt Covenant, Until January 31, 2019 | Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 100,000,000    
Debt Covenant, From February 1, 2019 Until Expiration | Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 50,000,000    
Interest rate         3.50%    
Debt Covenant, November 1, 2018 To December 31, 2018 | Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate         2.00%    
Debt Covenant, January 1, 2019 To January 31, 2019 | Revolving Credit Facility              
Debt Instrument [Line Items]              
Interest rate         3.00%    
Subsequent event | Revolving Credit Facility              
Debt Instrument [Line Items]              
Long term debt       $ 43,195,000      
Subsequent event | Revolving Credit Facility | Waiver Agreement [Member]              
Debt Instrument [Line Items]              
Minimum tangible net worth $ 170,000,000            
Interest coverage ratio 1.05            
Payment of waiver fee $ 225,000            
Subsequent event | Debt Covenant, Facility Repaid And Terminated On Or Before February 27, 2019 | Revolving Credit Facility | Waiver Agreement [Member]              
Debt Instrument [Line Items]              
Waiver fee refund 150,000            
Subsequent event | Debt Covenant, Facility Repaid And Terminated After February 27, 2019 And On Or Before March 6, 2019 | Revolving Credit Facility | Waiver Agreement [Member]              
Debt Instrument [Line Items]              
Waiver fee refund $ 75,000