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Accrued Liabilities (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 1,762,000 $ 2,066,000  
Accrued product warranty 1,048,000 588,000 1,003,000
Current portion of royalty payments 800,000 800,000  
Accrued professional services 543,000 609,000  
Dividends payable by consolidated joint ventures 649,000 0  
Accrued income taxes 125,000 640,000  
Other accrued liabilities 2,359,000 2,499,000  
Accrued liabilities, total $ 7,286,000 $ 7,202,000