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A reconciliation of income tax benefit to the amount computed by applying the Federal income tax rate to loss before provision for income taxes as of December 31, 2024 and 2023 is as follows: (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]    
Income tax credit at statutory rates $ 937 $ (921)
Under accrual of income taxes (1) (3)
Nondeductible expenses 5 23
Record tax credits (116) (118)
Permanent tax deduction stock options exercised (27) (63)
State income tax, net of federal benefits 179 (165)
Expiration of net operating losses and credits 332 1,492
Effect of change in deferred tax rate 49 45
Expiration of stock options 46 60
Other (39)
Change in valuation allowance (1,138) (344)
  $ 227 $ 6