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Patents and Other Intangible Assets (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Balance Beginning $ 2,845,000 $ 2,329,000
Abandonments and impairments (1,971,000) (593,000)
Additions 913,000 1,109,000
Balance Ending 1,787,000 2,845,000
Duplex [Member]    
Balance Beginning 1,131,000 481,000
Abandonments and impairments (757,000) (19,000)
Additions 546,000 669,000
Balance Ending 920,000 1,131,000
Electrodynamic Combustion Control [Member]    
Balance Beginning 1,714,000 1,848,000
Abandonments and impairments (1,214,000) (574,000)
Additions 367,000 440,000
Balance Ending $ 867,000 $ 1,714,000