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INCOME TAXES - (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 27, 2020
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
INCOME TAXES        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%    
Effective Income Tax Rate Reconciliation, Percent   (4.58%)    
Liability for uncertain tax positions   $ 0   $ 0
Payroll Protection Payroll (PPP) Program Loan        
INCOME TAXES        
Proceeds from debt $ 5,051      
Forgiveness $ 4,851      
Deferred tax asset, nondeductible expense, PPP loan expenses     $ 1,276 $ 1,276