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Income Taxes - Deferred income tax balances (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Deferred tax assets: |  |
Stock and long-term compensation plans | $ 1,224,000 | $ 1,515,000
Foreign NOL & other carryforwards | 48,705,000 | 45,390,000
U.S. and state NOL carryforwards | 8,128,000 | 7,866,000
Deferred revenue | 219,000 | 650,000
Pension liability | 436,000 | 531,000
Depreciation and amortization | 0 | 1,626,000
Intangible assets | 7,855,000 | 0
Lease liability | 2,310,000 | 2,383,000
Capitalized research and development | 1,054,000 | 446,000
Accrued expenses and other | 1,036,000 | 948,000
Total gross deferred tax assets | 70,967,000 | 61,355,000
Less: Valuation allowance | (37,246,000) | (47,844,000)
Net deferred income tax assets | 33,721,000 | 13,511,000
Deferred tax liabilities: |  |
Accruals | 0 | 367,000
Tax on unremitted foreign earnings | 3,516,000 | 1,164,000
Right of use asset | 2,527,000 | 2,095,000
Intangible assets | 0 | 2,217,000
Depreciation and amortization | 2,378,000 | 0
Tax on credits | 4,810,000 | 3,689,000
Contract acquisition costs | 3,654,000 | 3,325,000
Deferred tax liabilities | 16,885,000 | 12,857,000
Net deferred tax assets | $ 16,836,000 | $ 654,000

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