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STOCK-BASED COMPENSATION PLAN - Narrative (Details) $ in Thousands									3 Months Ended				9 Months Ended		12 Months Ended
	Jun. 11, 2025 shares	Mar. 17, 2025 USD ($) segment shares	Mar. 06, 2024 USD ($) segment shares	Jan. 16, 2024 USD ($) shares	May 08, 2023 shares	Mar. 08, 2023	Mar. 09, 2022 shares	Oct. 01, 2021 shares	Sep. 30, 2025 USD ($) shares	Jun. 30, 2025 shares	Mar. 31, 2025	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 shares	Jun. 21, 2023 shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation expense capitalized \| $									$ 0			$ 0	$ 0	$ 0
Number of operating segments \| segment		3	3										3
Senior Management Member
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage															0.00%
Chief Executive Officer and Chief Financial Officer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage															0.00%
President of Environmental Technologies \| May 8th, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage											50.00%
President of Environmental Technologies \| March 6th, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage											100.00%
President of Environmental Technologies \| March 17th, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage											100.00%
Performance-Based Restricted Stock Granted March 17 2025 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)		49,098
Granted, fair value \| $		$ 400
Unvested shares outstanding (in shares)									44,791				44,791
Performance-Based Restricted Stock Granted March 17 2025 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents \| Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage													100.00%
Performance-Based Restricted Stock Granted March 17 2025 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents \| Share-Based Payment Arrangement, Tranche One \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage		0.00%
Performance-Based Restricted Stock Granted March 17 2025 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents \| Share-Based Payment Arrangement, Tranche One \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage		150.00%
Performance-Based Restricted Stock Granted March 6 2024 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)			33,539
Granted, fair value \| $			$ 400
Unvested shares outstanding (in shares)									30,597				30,597
Performance-Based Restricted Stock Granted March 6 2024 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents \| Share-Based Payment Arrangement, Tranche One \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage			0.00%
Performance-Based Restricted Stock Granted March 6 2024 \| Chief Executive Officer, Chief Financial Officer, and Division Presidents \| Share-Based Payment Arrangement, Tranche One \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage			150.00%
Performance-Based Restricted Stock Granted March 6 2024 \| Chief Executive Officer, Chief Financial Officer And Other Members Of Senior Management \| Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage									50.00%	100.00%
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)													49,098
Unvested shares outstanding (in shares)									100,224				100,224		88,949
Forfeited (in shares)													37,823
Performance Shares \| Senior Management Member
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)								5,000
Performance Shares \| Chief Executive Officer and Chief Financial Officer
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)							20,493
Performance Shares \| Chief Executive Officer, Chief Financial Officer And Other Members Of Senior Management
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unvested shares outstanding (in shares)									16,605	16,605			16,605
Performance Shares \| Chief Executive Officer, Chief Financial Officer And Other Members Of Senior Management \| Share-Based Payment Arrangement, Tranche One \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage						0.00%
Options vesting period						3 years
Performance Shares \| Chief Executive Officer, Chief Financial Officer And Other Members Of Senior Management \| Share-Based Payment Arrangement, Tranche One \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage						150.00%
Performance Shares \| Chief Executive Officer, Chief Financial Officer And Other Members Of Senior Management \| Share-Based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage										0.00%	50.00%
Performance Shares \| President of Environmental Technologies
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)		4,307	2,942		5,081
Forfeited (in shares)	12,330
Performance-Based Restricted Stock Granted January 16 2024 \| President of Process Technologies
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)				8,231
Granted, fair value \| $				$ 100
Performance-Based Restricted Stock Granted January 16 2024 \| President of Process Technologies \| Share-Based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage									0.00%	100.00%
Performance-Based Restricted Stock Granted January 16 2024 \| President of Process Technologies \| Share-Based Payment Arrangement, Tranche One \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage				0.00%
Performance-Based Restricted Stock Granted January 16 2024 \| President of Process Technologies \| Share-Based Payment Arrangement, Tranche One \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting rights percentage				150.00%
The 2023 Stock Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for issuance (in shares) (up to)									350,000				350,000
Shares available for grant and issuance (in shares)									436,980				436,980			1,117,942
Shares reserved for future issuance (in shares)									50,113				50,113
Unrecognized compensation expense \| $									$ 3,900				$ 3,900
Unrecognized compensation expense, period for recognition													2 years 7 months 6 days