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Shareholders' Equity (Stock Options Activity Roll-forward) (Details)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Options Outstanding - Number of Shares  
Options outstanding as of December 31, 2019: | shares 533,484
Granted | shares 234,000
Exercised | shares (25,563)
Canceled and forfeited | shares (4,896)
Expired | shares (17,958)
Options outstanding as of December 31, 2020: | shares 719,067
Options Outstanding - Weighted Average Exercise Price  
Options outstanding as of December 31, 2019: | $ / shares $ 2.87
Granted | $ / shares 2.00
Exercised | $ / shares 2.74
Canceled and forfeited | $ / shares 3.98
Expired | $ / shares 5.16
Options outstanding as of December 31, 2020: | $ / shares $ 2.53