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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, 2020
Dec. 31, 2019
Stock Options:    
Stock options outstanding, beginning 3,680,000  
Granted 545,000  
Exercised (84,500) (36,000)
Forfeited or expired (727,500)  
Stock options outstanding, ending 3,413,000 3,680,000
Exercisable, ending 2,515,000  
Shares available for grant, ending 2,455,000  
Weighted Average Exercise Price    
Beginning Balance $ 0.64  
Granted 0.45  
Exercised 0.44  
Forfeited or expired 0.83  
Ending Balance 0.57 $ 0.64
Exercisable $ 0.59  
Weighted Average Remaining Contractual Term, Outstanding, end 4 years 10 months 24 days  
Weighted Average Remaining Contractual Term Years, Exercisable, end 4 years 1 month 6 days  
Aggregate Intrinsic Value    
Intrinsic Value, Outstanding, end $ 1,056  
Intrinsic Value, Exercisable, end $ 753