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Stock Options and Stock Grants (Details 1) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Stock Options:    
Stock options outstanding, beginning 2,933,000  
Granted 515,000  
Exercises (118,000) (44,000)
Forfeited or expired (189,000)  
Stock options outstanding, ending 3,141,000 2,933,000
Exercisable 2,296,000  
Shares available for grant 796,000  
Weighted Average Exercise Price    
Beginning Balance $ 0.81  
Granted 0.68  
Exercised 0.40  
Forfeited or expired 2.08  
Ending Balance 0.73 $ 0.81
Exercisable $ 0.79  
Weighted Average Remaining Contractual Term, Outstanding 5 years 9 months 18 days  
Weighted Average Remaining Contractual Term Years, Exercisable 4 years 9 months 18 days  
Aggregate Intrinsic Value    
Intrinsic Value, Outstanding $ 183  
Intrinsic Value, Exercisable $ 147