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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets      
Accrued expenses and reserves $ 53,000 $ 57,000 $ 117,000
Net operating loss and credit carryforwards 1,574,000 1,968,000 529,000
Right of use liability 7,630,000 8,458,000  
Other 889,000 665,000 13,000
Total deferred tax assets 10,146,000 11,148,000 659,000
Deferred tax liabilities      
Property, plant and equipment (1,907,000) (2,207,000) (5,000)
Accrued expenses and reserves 1,598,000 1,530,000  
Intangible assets (5,838,000) (6,581,000)  
Right of use asset (7,450,000) (8,321,000)  
Other (216,000) (7,000) (9,000)
Total deferred tax liabilities (17,009,000) (18,646,000) (14,000)
Net deferred tax (liability) asset before valuation allowance (6,863,000) (7,498,000) 645,000
Valuation allowance (147,000) (144,000) $ (645,000)
Net deferred tax liability $ (7,010,000) $ (7,642,000)