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Shareholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended
Jan. 01, 2020
Jan. 01, 2018
Mar. 31, 2020
Mar. 31, 2019
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, intrinsic value     $ 1,000 $ 1,200,000
Options exercisable, intrinsic value     0 941,000
Intrinsic value of options exercised     $ 0 $ 0
Restricted Stock Unit [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year  
Restricted Stock Unit [Member] | Non-Employee Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Value of annual restricted stock unit award $ 25,000 $ 15,000    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Withheld shares as payment for withholding taxes     17,928  
Average price paid per share     $ 0.31  
Stock Option And Non-Vested Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense     $ 123,000  
Weighted average period for unrecognized compensation expense     1 year 10 months 24 days  
2011 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available     7,115,473  
2011 Plan [Member] | Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, authorized shares     12,084,032  
Common stock, authorized shares increase     1,300,000  
Common stock, authorized percent increase     4.00%  
Percentage of outstanding stock maximum     10.00%  
2011 Plan [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period     10 years  
Vesting period     48 months  
2011 Plan [Member] | Cliff Vesting [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting percentage     25.00%  
Years after grant date     1 year  
2011 Plan [Member] | In Equal Monthly [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     36 months  
Stock option vesting percentage     75.00%