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NOTES PAYABLE AND LONG-TERM DEBT - Narrative (Details)
9 Months Ended
Apr. 20, 2020
USD ($)
Aug. 21, 2019
USD ($)
Jun. 29, 2018
USD ($)
Mar. 31, 2020
USD ($)
Performance bonds        
Line of Credit Facility [Line Items]        
Performance bonds outstanding, financial assurance       $ 1,000,000.0
Letter of Credit        
Line of Credit Facility [Line Items]        
Amount outstanding       $ 100,000
Credit Agreement        
Line of Credit Facility [Line Items]        
Maturity extension period     2 years  
Maximum borrowing capacity     $ 14,000,000.0  
Percentage of eligible accounts receivable considered for borrowing base     80.00%  
Percentage of eligible inventory considered for borrowing base     50.00%  
Borrowing base, monetary benchmark     $ 3,000,000  
Basis spread of variable rate     0.00%  
Interest rate       3.62%
Unused capacity, commitment fee percentage       0.25%
Remaining borrowing capacity       $ 12,900,000
Credit Agreement | Maximum        
Line of Credit Facility [Line Items]        
Debt cash flow leverage ratio       3.0
Credit Agreement | Minimum        
Line of Credit Facility [Line Items]        
Debt service coverage ratio       1.15
Credit Agreement | Term Loan        
Line of Credit Facility [Line Items]        
Maturity period     5 years  
Interest rate       3.62%
Credit Agreement | Working Capital        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 6,000,000.0  
Remaining borrowing capacity       $ 5,900,000
Credit Agreement | Acquisitions        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 8,000,000.0  
Percentage of portion allocated to acquisition purchase price     75.00%  
Remaining borrowing capacity       $ 7,000,000
Credit Agreement | Letter of Credit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 2,000,000.0  
Credit Agreement | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread of variable rate     2.50%  
Debt instrument, term of variable rate     1 month  
Credit Agreement | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Basis spread of variable rate     3.00%  
Loan Agreement        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 3,200,000.0    
Interest rate       3.62%
Remaining borrowing capacity       $ 1,900,000
Interest rate at expiration of advancing period       4.15%
Loan Agreement | Term Loan        
Line of Credit Facility [Line Items]        
Maturity period   5 years    
Interest rate       3.62%
Loan Agreement | Real Estate        
Line of Credit Facility [Line Items]        
Remaining borrowing capacity   $ 2,000,000.0   $ 1,400,000
Useful life   20 years    
Loan Agreement | Equipment        
Line of Credit Facility [Line Items]        
Remaining borrowing capacity   $ 1,200,000.0   $ 500,000
Useful life   6 years    
Loan Agreement | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread of variable rate     2.50%  
Subsequent Event | Credit Agreement | Working Capital        
Line of Credit Facility [Line Items]        
Remaining borrowing capacity $ 6,000,000      
Subsequent Event | Credit Agreement | Acquisitions        
Line of Credit Facility [Line Items]        
Remaining borrowing capacity $ 8,000,000      
Subsequent Event | PPP Loan | Term Loan        
Line of Credit Facility [Line Items]        
Maturity period 2 years      
Face amount $ 2,200,000      
Interest rate 1.00%      
Deferral period 6 months