INCOME AND OTHER TAXES - Income tax reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Amount:
U.S. federal statutory tax benefit	$ (911,000)	$ (363,000)
State income tax, net of federal benefit		(30,000)
Impact of change in foreign exchange rate		532,000
Foreign tax rate difference		(63,000)
Adjustment for prior year tax estimate	230,000
Change in valuation allowance	623,000
Other	8,000
Nontaxable or nondeductible items
Share-based compensation	188,000	21,000
Excess tax benefits from stock-based compensation	(674,000)
VAT refund reserve and other non-deductible items		257,000
Total income tax expense	$ 0	$ 0
Tax Jurisdiction of Domicile [Extensible Enumeration]	US	US
Percent:
Effective tax rate	21.00%
Adjustment for prior year tax estimate	(5.30%)
Change in valuation allowance	(14.40%)
Other	(0.20%)
Nontaxable or nondeductible items
Share-based compensation	(4.40%)
Excess tax benefits from stock-based compensation	15.60%
US
Amount:
State income tax, net of federal benefit	$ (46,000)
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration]	MONTANA
Montana worldwide election and apportionment	$ (99,000)
Adjustment for prior year tax estimate		$ 155,000
Change in valuation allowance		57,000
Percent:
State income tax, net of federal benefit	1.10%
Montana worldwide election and apportionment	2.30%
Foreign
Amount:
Adjustment for prior year tax estimate		63,000
Change in valuation allowance		$ (629,000)
Mexico
Amount:
Impact of change in foreign exchange rate	$ (370,000)
Foreign tax rate difference	(255,000)
Inflation indexation of net operating loss carryforwards	(150,000)
Expiration of net operating loss carryforwards	761,000
Adjustment for prior year tax estimate	(76,000)
Release of valuation allowance due to net operating loss expiration	(761,000)
Change in valuation allowance	1,491,000
Other	$ (46,000)
Percent:
Impact of change in foreign exchange rate	8.50%
Foreign tax rate difference	5.90%
Inflation indexation of net operating loss carryforwards	3.50%
Expiration of net operating loss carryforwards	(17.50%)
Adjustment for prior year tax estimate	1.80%
Release of valuation allowance due to net operating loss expiration	17.50%
Change in valuation allowance	(34.40%)
Other	1.10%
Canada
Amount:
Change in valuation allowance	$ 110,000
Other	$ (23,000)
Percent:
Change in valuation allowance	(2.60%)
Other	0.50%