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Debt - Narrative (Details) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2020 USD ($) | Sep. 20, 2019 | Dec. 31, 2020 USD ($) invoice | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 17, 2018 USD ($) | Aug. 08, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Number of customer invoices factored | invoice |  |  | 1 |  |  |  |
Foreign subsidiary borrowings |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Receivables pledged as collateral |  |  | $ 955,000 | $ 1,859,000 |  |  |
Remaining debt balance |  |  | $ 7,883,000 | 5,759,000 |  |  |
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% |  |  |  |
2018 Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Percentage of stock pledged on credit agreement |  | 66.67% |  |  |  |  |
Fixed charge coverage ratio |  |  | 1.1 |  |  |  |
Percent availability under revolving commitment |  |  | 12.50% |  |  |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 30,000,000
Accordion feature, increase limit |  |  |  |  |  |  | $ 10,000,000
Weighted average interest rate, revolving credit facility |  |  | 1.70% |  |  |  |
Commitment fee percentage |  |  | 0.25% |  |  |  |
Debt issuance costs incurred |  |  | $ 212,000 |  |  |  |
Revolving line of credit, accumulated amortization of debt issuance costs |  |  | $ 229,000 | $ 205,000 |  |  |
2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on LIBOR |  |  | 1.50% |  |  |  |
Fourth Amendment to Credit Agreement | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Percent availability under revolving commitment |  |  | 12.50% | 12.50% |  |  |
Receivables pledged as collateral |  |  | $ 26,724,000 | $ 26,964,000 |  |  |
Fourth Amendment to Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | 35,000,000 | 35,000,000 |  |  |
Remaining borrowing capacity |  |  | $ 16,767,000 | $ 13,284,000 |  |  |
Export Credit Facility | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | $ 5,000,000 |
Weighted average interest rate, revolving credit facility |  |  | 1.20% | 1.20% |  |  |
Export Credit Facility | Revolving credit agreement | Revolving credit agreement | LIBOR |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Basis spread on LIBOR |  |  | 1.00% |  |  |  |
PPP Loan | Unsecured Promissory Note |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, term | 2 years |  |  |  |  |  |
Face amount | $ 5,025,000 |  |  |  |  |  |
Interest rate | 0.98% |  |  |  |  |  |
Deferral term | 6 months |  |  |  |  |  |
First And Second Amendment to 2018 Credit Agreement | Revolving credit agreement | Revolving credit agreement |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  | $ 75,000 |  |
JPMorgan Chase Bank, N.A. | PPP Loan | Unsecured Promissory Note |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Repayment debt |  |  |  | $ 261,000 |  |  |
Remaining debt balance |  |  | $ 4,764,000 | $ 4,764,000 |  |  |

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