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Stock And Stock Options (Schedule Of Stock Options Outstanding And Exercisable) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 3.18 $ 3.73 $ 4.70
Options Outstanding 16,875 30,000 37,500
Options Exercisable 16,875    
$4.10 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 4.10    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 0 years    
Options Exercisable 1,875    
$4.80 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 4.80    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 2 months 12 days    
Options Exercisable 1,875    
$4.40 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 4.40    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 6 months    
Options Exercisable 1,875    
$4.40 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 4.40    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 9 months 18 days    
Options Exercisable 1,875    
$2.50 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 2.50    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 1 year    
Options Exercisable 1,875    
$2.30 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 2.30    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 1 year 2 months 12 days    
Options Exercisable 1,875    
$2.70 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 2.70    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 1 year 6 months    
Options Exercisable 1,875    
$2.20 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 2.20    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 1 year 9 months 18 days    
Options Exercisable 1,875    
$1.20 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted Average Exercise Price $ 1.20    
Options Outstanding 1,875    
Weighted Average Remaining Contractual Life 2 years    
Options Exercisable 1,875