STOCK INCENTIVE PLAN - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	May 31, 2025	Apr. 02, 2024	May 26, 2023	Aug. 01, 2016
Restricted Stock Unit Transactions - Shares
Nonvested, beginning balance (in shares)			214,493	146,835
Granted (in shares)			133,369	118,493
Vested (in shares)			(97,900)	(50,835)
Nonvested, ending balance (in shares)	249,962	214,493	249,962	214,493	146,835
Restricted Stock Unit Transactions - Weighted average grant date fair value
Nonvested, beginning balance (in dollar per share)			$ 38.81	$ 33.98
Granted (in dollar per share)			44.68	45.99
Vested (in dollar per share)			49.29	31.44
Nonvested, ending balance (in dollar per share)	$ 41.24	$ 38.81	$ 41.24	$ 38.81	$ 33.98
Vested shares include shares vested		21,094		21,094
Restricted share unit activity - Additional data
Total compensation cost, net of estimated forfeitures, related to non-vested restricted stock unit awards not yet recognized, pre-tax	$ 3,543	$ 3,793	$ 3,543	$ 3,793	$ 3,154
Weighted-average period in years over which restricted stock unit cost is expected to be recognized (in years)			1 year 3 months 18 days	1 year 7 months 6 days	3 years 2 months 12 days
Total grant date fair value of shares of common stock vested during the year			$ 4,825	$ 1,598	$ 958
Stock Repurchase Program
Amount authorized for purchase of share							$ 25,000
Repurchase of common stock (shares)	59,686	0	144,368	49,500
Total cost of shares repurchased	$ 2,200		$ 5,986	$ 2,898
Repurchase price per share	$ 37.25		$ 41.46	$ 58.58
2023 Non Employee Director Stock Plan
Restricted Stock Unit Transactions - Shares
Number of shares of common stock are available for issuance								125,000
2023 Non Employee Director Stock Plan \| Director
Restricted Stock Unit Transactions - Shares
Vesting period of options			1 year
2025 Stock incentive Plan
Restricted Stock Unit Transactions - Shares
Number of shares available for granting options						500,000
2016 Equity Incentive Plan
Restricted Stock Unit Transactions - Shares
Number of shares available for granting options									800,000
2016 Equity Incentive Plan \| Minimum \| Executive Officer
Restricted Stock Unit Transactions - Shares
Vesting period of options			3 years
2016 Equity Incentive Plan \| Maximum \| Executive Officer
Restricted Stock Unit Transactions - Shares
Vesting period of options			5 years

MILLER INDUSTRIES INC /TN/ 10-K