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Debt - Narrative (Details) |  |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 17, 2018 USD ($) | Nov. 05, 2018 | Aug. 08, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Short-term debt arrangement |  |  |  |  | $ 18,630,000 | $ 21,253,000
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 |  |  |  |  | 4.00% |
2018 Credit Agreement | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Fixed charge coverage ratio |  |  | 1.1 |  |  |
Percent availability under revolving commitment |  |  | 12.50% |  |  |
Percentage of stock pledged on credit agreement |  | 66.67% |  |  |  |
2018 Credit Agreement | Line of Credit | Revolving credit agreement |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 30,000 |  |  |
Accordion feature, increase limit |  |  | $ 10,000 |  |  |
Remaining borrowing capacity |  |  |  |  | $ 9,134,000 | $ 8,437,000
Weighted average interest rate, revolving credit facility |  |  |  |  | 4.24% | 3.85%
Commitment fee percentage |  |  | 0.25% |  |  |
Debt issuance costs incurred |  |  |  |  | $ 212,000 |
Revolving line of credit, accumulated amortization of debt issuance costs |  |  |  |  | $ 47,000 | $ 12,000
2018 Credit Agreement | Line of Credit | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on LIBOR |  |  | 1.75% |  |  |
First Amendment To Credit Agreement And Security Agreement | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Coverage ratio threshold for three or more business days in consecutive thirty day period |  | 12.50% |  |  |  |
Export Credit Facility | Line of Credit | Revolving credit agreement |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 5,000,000 |  |  |  |  |
Accordion feature, increase limit | $ 35,000,000 |  |  |  |  |
Weighted average interest rate, revolving credit facility |  |  |  |  | 3.74% |
Export Credit Facility | Line of Credit | Revolving credit agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on LIBOR | 1.25% |  |  |  |  |
First and Second Amendment | Line of Credit | Revolving credit agreement |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  | $ 75,000 |
Short Term Debt Arrangement For Working Capital Purposes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  |  | 6 months |  |
Short-term debt arrangement |  |  |  | $ 1,137,000 |  |
As Of August 31, 2018 Or September 30, 2018 | First Amendment To Credit Agreement And Security Agreement | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Fixed charge coverage ratio |  | 1.1 |  |  |  |
On Or After October 31, 2018 | First Amendment To Credit Agreement And Security Agreement | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Fixed charge coverage ratio |  | 1.1 |  |  |  |

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