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NOTES PAYABLE AND LONG-TERM DEBT - Narrative (Details)
6 Months Ended
Aug. 21, 2019
USD ($)
Jun. 29, 2018
USD ($)
Dec. 31, 2019
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     4.39%
Unused capacity, commitment fee percentage     0.25%
Remaining borrowing capacity     $ 12,700,000
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  
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     $ 6,800,000
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     4.39%
Remaining borrowing capacity     $ 2,600,000
Interest rate at expiration of advancing period     4.15%
Loan Agreement | Term Loan      
Line of Credit Facility [Line Items]      
Maturity period 5 years    
Loan Agreement | Real Estate      
Line of Credit Facility [Line Items]      
Remaining borrowing capacity $ 2,000,000.0   $ 1,800,000
Useful life 20 years    
Loan Agreement | Equipment      
Line of Credit Facility [Line Items]      
Remaining borrowing capacity $ 1,200,000.0   $ 800,000
Useful life 6 years    
Loan Agreement | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread of variable rate   2.50%