Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax      
Valuation allowance $ 65,640,000 $ 57,369,000 $ 43,500,000
Capitalized research expenses 5,800,000 19,900,000  
Penalties or interest liabilities accrued 0 0 0
Pretax income 6,500,000 100,000 (3,300,000)
Foreign subsidiaries' undistributed earnings   13,600,000  
Deferred tax liabilities for undistributed foreign earnings 100,000 200,000  
Tax benefit relating to the NOL carryback provisions CARES Act 0 0 $ 300,000
Research and development tax credits      
Income Tax      
Tax credit carryforwards 500,000    
Luminescent Systems Canada Inc.      
Income Tax      
Foreign subsidiaries' undistributed earnings 1,900,000 $ 3,400,000  
Federal      
Income Tax      
Operating loss carryforwards 1,900,000    
Operating loss carryforwards, subject to expiration 1,500,000    
Operating loss carryforwards, not subject to expiration 400,000    
Foreign Tax Authority      
Income Tax      
Tax credit carryforwards 200,000    
State      
Income Tax      
Net operating loss carryforwards 138,600,000    
Tax credit carryforwards $ 900,000