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ACCRUED EXPENSES (Details - Components of accrued expenses) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accrued Expenses:    
Accrued vacation $ 255 $ 246
Accrued salaries and bonus 1,382 1,086
Vendor accruals 75 50
Accrued warranty 19 27
Customer prepayments 950 0
Other accrued expense 1,132 1,328
Total accrued expenses 3,813 2,737
Other Long-Term Liabilities:    
Long-term deferred tax liability 1,662 1,698
Acquired long-term liability 3,716 3,787
Total long-term liabilities $ 5,378 $ 5,485