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Debt - Narrative (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2021 USD ($) | Feb. 18, 2021 | Apr. 10, 2020 USD ($) | Dec. 31, 2020 | Jun. 30, 2021 USD ($) lender | Sep. 30, 2021 USD ($) customer | Sep. 30, 2020 USD ($) | Dec. 17, 2018 USD ($) | Aug. 08, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Number of customer invoices factored | customer |  |  |  |  |  | 1 |  |  |
Revolving credit agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Percentage of stock pledged on credit agreement | 66.67% |  |  |  |  |  |  |  |
Notes Payable to Banks |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Weighted average interest rate, revolving credit facility |  |  |  |  |  | 2.70% |  |  |
Debt face amount |  |  |  |  |  | $ 1,465,000 |  |  |
Long-term loan repayment schedule period |  |  |  |  |  | 72 months |  |  |
Notes Payable to Banks | Minimum |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 6 months |  |  |
Notes Payable to Banks | Maximum |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 12 months |  |  |
Notes Payable to Banks | Euro Interbank Offered Rate (Euribor) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  |  |  | 3.20% |  |  |
Foreign subsidiary borrowings |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Receivables pledged as collateral |  |  |  |  |  | $ 485,000 | $ 1,859,000 |  |
Long-term debt |  |  |  |  |  | $ 6,632,000 | $ 5,759,000 |  |
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Minimum |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Euribor variable interest rates |  |  |  |  |  | 1.00% |  |  |
Foreign subsidiary borrowings | Euro Interbank Offered Rate (Euribor) | Maximum |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Euribor variable interest rates |  |  |  |  |  | 4.20% |  |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 30,000
Weighted average interest rate, revolving credit facility |  |  |  |  |  |  | 1.70% |  |
Debt issuance costs incurred |  |  |  |  |  | $ 45,000 |  |  |
Debt instrument, unamortized discount premium |  |  |  |  |  | 86,000 |  |  |
Revolving line of credit, accumulated amortization of debt issuance costs |  |  |  |  |  | $ 17,000 | $ 205,000 |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  |  |  |  | 1.50% |  |
Export Credit Facility | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 7,000 |  |  |  |  |  |  | $ 5,000 |
Weighted average interest rate, revolving credit facility |  |  |  |  |  | 1.30% | 1.20% |  |
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  | 1.00% |  | 1.25% |  |  |
Paycheck Protection Program Loan | Unsecured Debt |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 2 years |  |  |  |  |  |
Debt face amount |  |  | $ 5,025,000 |  |  |  |  |  |
Interest rate, fixed percentage |  |  | 0.98% |  |  |  |  |  |
Deferral term |  |  | 6 months |  |  |  |  |  |
Paycheck Protection Program Loan | Unsecured Debt | JPMORGAN CHASE BANK N.A. |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 261,000 |  |
Long-term debt |  |  |  |  |  | $ 4,764,000 | 4,764,000 |  |
Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  | 1.1 |  |  |
Percent availability under revolving commitment |  | 12.50% |  | 12.50% |  | 10.00% |  |  |
Debt instrument, covenant combined commitment percentage |  |  |  |  |  | 10.00% |  |  |
Debt instrument, covenant combined borrowing base, percentage |  |  |  |  |  | 10.00% |  |  |
Debt instrument, covenant combined borrowing base, amount |  |  |  |  |  | $ 2,000 |  |  |
Receivables pledged as collateral |  |  |  |  |  | 25,370,000 | 26,964,000 |  |
Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | 28,000 |  |  |  |  | 35,000 | 35,000 |  |
Accordion feature, increase limit | 10,000 |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  | $ 14,570,000 | $ 13,284,000 |  |
Weighted average interest rate, revolving credit facility |  |  |  |  |  | 1.84% |  |  |
Commitment fee percentage |  |  |  | 0.25% |  | 0.25% |  |  |
Credit Agreement | Revolving credit agreement | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on LIBOR |  |  |  |  |  | 1.75% |  |  |
Fifth Amendment to Credit Agreement and First Amendment to Export Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 35,000 |  |  |  |  |  |  |  |
First Loan |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 7 years |  |  |  |
Debt face amount |  |  |  |  | $ 717,000 |  |  |  |
Debt instrument, number of lenders | lender |  |  |  |  | 2 |  |  |  |
Debt instrument, decrease, forgiveness |  |  |  |  | $ 287,000 |  |  |  |
Second Loan |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 5 years |  |  |  |
Debt face amount |  |  |  |  | $ 303,000 |  |  |  |

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