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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Deferred Tax Assets:    
Research and experimental expenditures $ 12,552 $ 8,118
Long-term contracts 7,480 0
Deferred compensation 2,868 2,274
Uniform capitalization and inventory 1,511 1,253
Credit carryforwards 1,304 1,378
Warranty accrual 1,304 752
Stock-based compensation 1,269 1,555
Net operating loss 1,248 7,432
Reserve for accrued employee benefits 1,029 988
Other 655 317
Deferred tax assets 31,220 24,067
Deferred Tax Liabilities:    
Depreciation and amortization (3,773) (3,545)
Retention and other (1,310) (1,491)
Deferred tax liabilities (5,083) (5,036)
Less: valuation allowance (1,599) (1,967)
Net deferred tax asset $ 24,538 $ 17,064