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Shareholders' Equity (Details 1) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Series 2 Warrants [Member]      
Statement Line Items [Line Items]      
Outstanding at beginning of year: 1,285,260 1,292,280
Issuance 1,292,280
Exercised (7,020)
Expired (1,285,260)
Outstanding at end of year 1,285,260 1,292,280
Series 1 Warrants [Member]      
Statement Line Items [Line Items]      
Outstanding at beginning of year: 1,292,280
Issuance   1,292,280
Exercised   (1,290,279)
Expired   (2,001)
Outstanding at end of year   1,292,280