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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Warranty costs $ 1,557 $ 1,254
Sales incentives and discounts 570 110
Stock-based compensation 824 866
Long-term retirement plan 3,960 3,099
Capitalized research and development 2,900 1,300
All others, net 465 490
Total deferred tax assets 10,276 7,119
Deferred tax liabilities:    
Depreciation and amortization expense (1,686) (1,092)
Net deferred tax assets $ 8,590 $ 6,027