Quarterly report pursuant to Section 13 or 15(d)

LEASES - Components of Lease Expense (Details)

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LEASES - Components of Lease Expense (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lessee, Lease, Description [Line Items]    
Total lease cost $ 1,083,000 $ 968,000
Short-term lease costs 200,000 100,000
Variable lease costs 0  
Cost of sales, exclusive of depreciation and amortization    
Lessee, Lease, Description [Line Items]    
Total operating lease cost 1,049,000 920,000
Selling, general and administrative    
Lessee, Lease, Description [Line Items]    
Total operating lease cost $ 34,000 $ 48,000