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Shareholders' Equity (Schedule of Shares Authorized Under Equity Compensation Plans, By Exercise Price) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number outstanding as of end of year 719,067 533,484
$2.00 - $2.00    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of exercise prices, minimum $ 2.00  
Range of exercise prices, maximum $ 2.00  
Number outstanding as of end of year 237,500  
Options outstanding, weighted average remaining contractual life 5 years 9 months 14 days  
Options outstanding, weighted average exercise price $ 2.00  
Number exercisable as of end of year 3,500  
Options exerciseable, weighted average exercise price $ 2.00  
2.46 - 2.46    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of exercise prices, minimum 2.46  
Range of exercise prices, maximum $ 2.46  
Number outstanding as of end of year 350,000  
Options outstanding, weighted average remaining contractual life 1 year 3 days  
Options outstanding, weighted average exercise price $ 2.46  
Number exercisable as of end of year 350,000  
Options exerciseable, weighted average exercise price $ 2.46  
2.79- 6.05    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of exercise prices, minimum 2.79  
Range of exercise prices, maximum $ 6.05  
Number outstanding as of end of year 131,567  
Options outstanding, weighted average remaining contractual life 2 years 7 months 2 days  
Options outstanding, weighted average exercise price $ 3.67  
Number exercisable as of end of year 105,150  
Options exerciseable, weighted average exercise price $ 3.54  
$2.00 - $6.05    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of exercise prices, minimum 2.00  
Range of exercise prices, maximum $ 6.05  
Number outstanding as of end of year 719,067  
Options outstanding, weighted average remaining contractual life 2 years 10 months 17 days  
Options outstanding, weighted average exercise price $ 2.53  
Number exercisable as of end of year 458,650  
Options exerciseable, weighted average exercise price $ 2.70