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Income Taxes - Deferred income tax balances (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
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