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Debt - Narrative (Details) |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2020 USD ($) | Sep. 20, 2019 USD ($) | Aug. 08, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 03, 2020 | Sep. 30, 2020 USD ($) invoice | Sep. 30, 2019 USD ($) | Dec. 17, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Number of customer invoices | invoice |  |  |  |  |  | 1 |  |
Notes Payable to Banks |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt agreement term |  |  |  | 6 months |  |  |  |
Debt face amount |  |  |  | $ 1,137,000 |  |  |  |
Notes Payable to Banks |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 2.70% |  |
Debt face amount |  |  |  |  |  | $ 1,465,000 |  |
Long-term loan repayment schedule period |  |  |  |  |  | 72 months |  |
Notes Payable to Banks | Minimum | Subsequent event |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt agreement term |  |  |  |  | 6 months |  |  |
Notes Payable to Banks | Maximum | Subsequent event |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt agreement 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 |  |  |  |  |  | $ 1,859,000 | $ 672,000 |
Long-term debt |  |  |  |  |  | $ 5,759,000 | $ 6,592,000 |
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 |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, covenant terms, fixed charge coverage ratio |  |  | 1.1 |  |  |  |  |
Line of credit facility, availability of revolving commitment, fixed charge coverage ratio threshold |  |  | 12.50% |  |  |  |  |
Line of credit facility, stock pledged, non-U.S. subsidiaries, percentage |  | 66.67% |  |  |  |  |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 30,000 |  |  |  |  |
Credit facility accordion feature, increase limit |  |  | $ 10,000 |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 1.70% | 3.60% |
Commitment fee |  |  |  |  |  | 0.25% |  |
Debt issuance costs incurred |  |  |  |  |  | $ 212,000 | $ 75,000 |
Revolving line of credit, accumulated amortization of debt issuance costs |  |  |  |  |  | $ 205,000 | $ 106,000 |
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 |  |  |  |  |  |  |  | $ 5,000,000
Credit facility accordion feature, increase limit |  |  |  |  |  |  |  | $ 35,000,000
Weighted average interest rate |  |  |  |  |  | 1.20% | 3.40% |
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% |
Third Amendment To Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, availability of revolving commitment, fixed charge coverage ratio threshold for three or more business days in any consecutive 30 day period |  | 12.50% |  |  |  |  |  |
Fourth Amendment To Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, covenant terms, fixed charge coverage ratio |  |  |  |  |  | 1.1 |  |
Line of credit facility, availability of revolving commitment, fixed charge coverage ratio threshold |  |  |  |  |  | 12.50% |  |
Line of credit facility, availability of revolving commitment, fixed charge coverage ratio threshold for three or more business days in any consecutive 30 day period |  | 10.00% |  |  |  |  |  |
Receivables pledged as collateral |  |  |  |  |  | $ 26,964,000 | $ 24,000,000 |
Fourth Amendment To Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | 35,000 | 35,000 |
Line of credit facility floor |  | $ 2,000,000 |  |  |  |  |  |
Line of credit facility, amount available |  |  |  |  |  | 13,284,000 | $ 7,709,000 |
Paycheck Protection Program Loan | Unsecured Debt |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt agreement 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 |  |
Long-term debt paid in 2021 |  |  |  |  |  | 3,176,000 |  |
Long-term debt paid in 2022 |  |  |  |  |  | $ 1,588,000 |  |

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