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Debt - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
customer
lender
Mar. 31, 2021
Sep. 30, 2021
USD ($)
Line of Credit Facility [Line Items]      
Number of customer invoices factored | customer 1    
Foreign subsidiary borrowings      
Line of Credit Facility [Line Items]      
Receivables pledged as collateral $ 491,000   $ 485,000
Remaining debt balance $ 5,866,000   6,632,000
Foreign subsidiary borrowings | Euribor | Minimum      
Line of Credit Facility [Line Items]      
Euribor variable interest rates 1.00%    
Foreign subsidiary borrowings | Euribor | Maximum      
Line of Credit Facility [Line Items]      
Euribor variable interest rates 4.20%    
First Loan      
Line of Credit Facility [Line Items]      
Debt instrument, number of lenders | lender 1    
Face amount $ 1,141,000    
Debt instrument, term 6 years    
Quarterly payment $ 56,000    
Revolving credit agreement | Credit Agreement      
Line of Credit Facility [Line Items]      
Receivables pledged as collateral $ 23,328,000   $ 25,370,000
Percent availability under revolving commitment 10.00%   10.00%
Revolving credit agreement | Credit Agreement | Revolving credit agreement      
Line of Credit Facility [Line Items]      
Revolving credit facility, maximum borrowing capacity $ 35,000,000   $ 35,000,000
Remaining borrowing capacity $ 12,157,000   $ 14,570,000
Weighted average interest rate, revolving credit facility 2.30%   1.80%
Commitment fee percentage 0.25%    
Revolving credit agreement | Credit Agreement | Revolving credit agreement | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on LIBOR 2.25%   1.75%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement      
Line of Credit Facility [Line Items]      
Weighted average interest rate, revolving credit facility 1.30%   1.30%
Revolving credit agreement | Export Credit Facility | Revolving credit agreement | LIBOR      
Line of Credit Facility [Line Items]      
Basis spread on LIBOR 1.25% 1.25%  
Revolving credit agreement | 2018 Credit Agreement | Revolving credit agreement      
Line of Credit Facility [Line Items]      
Remaining unamortized amount $ 86,000    
Revolving line of credit, accumulated amortization of debt issuance costs 24,000   $ 17,000
Unsecured Promissory Note | PPP Loan | JPMorgan Chase Bank, N.A.      
Line of Credit Facility [Line Items]      
Remaining debt balance $ 4,764,000   $ 4,764,000