INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Warranty costs	$ 1,380	$ 1,370
Sales incentives and discounts	224	436
Self-insurance	256	524
Stock-based compensation	1,059	908
Long-term retirement plan		4,767
Capitalized research and development		3,226
Federal net operating loss carryforwards	3,482
All others, net	344	331
Total deferred tax assets	6,745	11,562
Deferred tax liabilities:
Depreciation and amortization expense	(1,528)	(1,833)
Net deferred tax assets	$ 5,217	$ 9,729