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NOTES PAYABLE - BANKS, Santander Bank Facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Aug. 12, 2022
Jul. 13, 2022
Mar. 31, 2022
Sep. 30, 2021
Sep. 20, 2021
Revolving Line of Credit Facility [Abstract]            
Outstanding borrowings $ 26,396       $ 29,637  
Rubicon Technology, Inc. [Member]            
Revolving Line of Credit Facility [Abstract]            
Dividend payable     $ 2,500      
Bridge Term Loan [Member]            
Revolving Line of Credit Facility [Abstract]            
Face amount of debt     $ 12,000      
Maturity term of facility 20 days          
Maximum [Member] | Rubicon Technology, Inc. [Member]            
Revolving Line of Credit Facility [Abstract]            
Percentage of shares to purchase under cash tender offer   45.00% 45.00%      
Santander Bank Facility [Member]            
Revolving Line of Credit Facility [Abstract]            
Maximum borrowing capacity $ 35,000   $ 35,000 $ 31,500 30,000 $ 17,000
Percentage of accounts receivable 85.00%          
Permitted distribution amount $ 3,000       1,000  
Maturity date of facility Sep. 21, 2026          
Indebtedness guaranty $ 5,000       2,920  
Outstanding borrowings $ 26,396       $ 29,637  
Percentage of outstanding borrowings 75.40%       98.80%  
Effective interest rate 5.79%       3.00%  
Santander Bank Facility [Member] | LIBOR [Member]            
Revolving Line of Credit Facility [Abstract]            
Variable rate term 30, 60 or 90 day          
Basis spread on variable rate 2.25%          
Interest rate floor 0.75%          
Reduction of Interest rate floor 0.25%          
Santander Bank Facility [Member] | SOFR [Member]            
Revolving Line of Credit Facility [Abstract]            
Variable rate term one-month          
Basis spread on variable rate 2.75%          
Santander Bank Facility [Member] | Maximum [Member]            
Revolving Line of Credit Facility [Abstract]            
Permitted distribution amount $ 1,000