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K. INCOME TAXES - NARRATIVE (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Windfall tax benefits unrecognized $ 1,300,000      
Valuation allowance increase (decrease) 13,100,000 $ 2,100,000    
Valuation allowance 1,663,000 14,726,000    
Net operating loss carryforward $ 37,700,000      
Loss carryforward expiration date Dec. 31, 2032      
Research and development tax credits $ 1,500,000      
Research and development tax credit expiration date Dec. 31, 2036      
Federal income tax rate 35.00%      
China income tax rate 25.00%      
Provision on foreign subsidiariess $ 6,600,000      
Impact on effective tax rate 1,800,000      
Unrecognized tax benefits 1,797,000 1,797,000 $ 1,659,000 $ 2,200,000
Accrued penalties or interest   $ 0    
CHINA        
Net operating loss carryforward $ 8,300,000      
Loss carryforward expiration date Dec. 31, 2021      
Global [Member]        
China income tax rate 15.00%      
Tax rate effective period 3 years      
Extended period of tax preferential status 3 years