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Financing Arrangements (Narrative) (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) credit_line | May 31, 2023 USD ($) | Jul. 31, 2022 USD ($) | Dec. 31, 2018 EUR (€) credit_line | Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Current portion of long-term debt | $ 3,671,000 |  |  |  | $ 3,604,000
Long-Term Note |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term debt | 45,378,000 |  |  |  | 48,982,000
Current portion of long-term debt | 3,671,000 |  |  |  | $ 3,604,000
Unsecured Debt |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notes payable | 20,781,000 |  |  |  |
Notes payable, current | 1,188,000 |  |  |  |
Unsecured Debt | Scenario, Forecast |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notes payable |  | $ 15,438,000 |  |  |
Secured Debt |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notes payable | 24,597,000 |  |  |  |
Notes payable, current | $ 2,483,000 |  |  |  |
Interest rate | 2.74% |  |  | 2.74% |
Secured Debt | Scenario, Forecast |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notes payable |  |  | $ 15,375,000 |  |
London Interbank Offered Rate (LIBOR) | Unsecured Debt |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Spread on variable rate | 1.20% |  |  |  |
U S Line Of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit | $ 0 |  |  |  |
Guarantees issued | $ 930,000 |  |  |  |
US Long Term Note |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt service coverage ratio | 1.5 |  |  |  |
Maximum indebtedness against EBITDA | 3 |  |  |  |
US Long Term Note | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Covenant, debt service coverage | $ 50,000 |  |  |  |
US Long Term Note | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Covenant, debt service coverage | 250,000 |  |  |  |
Euro Line Of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit | 0 |  |  |  |
Guarantees issued | 1,166,000 |  |  |  |
Other European Facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing capacity | $ 2,289,000 |  |  | € 2,000,000 |
Number of credit lines | credit_line | 2 |  |  | 2 |
Letter of Credit | U S Line Of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing capacity | $ 50,000,000 |  |  |  |
Remaining borrowing capacity | $ 49,070,000 |  |  |  |
Letter of Credit | U S Line Of Credit | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Spread on variable rate | 0.80% |  |  |  |
Letter of Credit | U S Line Of Credit | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Spread on variable rate | 1.20% |  |  |  |
Letter of Credit | Euro Line Of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing capacity | $ 57,219,000 |  |  | € 50,000,000 |
Remaining borrowing capacity | 56,053,000 |  |  |  |
Letter of Credit | Other European Facilities |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit | 0 |  |  |  |
Remaining borrowing capacity | $ 2,289,000 |  |  |  |
Interest rate swap | Unsecured Debt |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Fixed interest rate | 2.85% |  |  | 2.85% |

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