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Stock And Stock Options (Schedule Of Stock Options Outstanding And Exercisable) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 4.70 $ 6.10 $ 5.70 $ 5.90
Options Outstanding 37,500 45,625 90,025 87,025
Options Exercisable 37,500      
$10.70 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 10.70      
Options Outstanding 1,875      
Weighted Average Remaining Contractual Life 3 months 18 days      
Options Exercisable 1,875      
$8.10 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 8.10      
Options Outstanding 1,875      
Weighted Average Remaining Contractual Life 6 months      
Options Exercisable 1,875      
$7.30 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 7.30      
Options Outstanding 1,875      
Weighted Average Remaining Contractual Life 9 months 18 days      
Options Exercisable 1,875      
$6.40 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 6.40      
Options Outstanding 1,875      
Weighted Average Remaining Contractual Life 1 year      
Options Exercisable 1,875      
$6.20 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 6.20      
Options Outstanding 1,875      
Weighted Average Remaining Contractual Life 1 year 2 months 12 days      
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 1 year 6 months      
Options Exercisable 1,875      
$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 1 year 9 months 18 days      
Options Exercisable 1,875      
$4.10 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 4.10      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 2 years      
Options Exercisable 2,500      
$4.80 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 4.80      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 2 years 2 months 12 days      
Options Exercisable 2,500      
$4.40 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 4.40      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 2 years 6 months      
Options Exercisable 2,500      
$4.40 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 4.40      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 2 years 9 months 18 days      
Options Exercisable 2,500      
$2.50 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 2.50      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 3 years      
Options Exercisable 2,500      
$2.30 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 2.30      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 3 years 2 months 12 days      
Options Exercisable 2,500      
$2.70 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 2.70      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 3 years 6 months      
Options Exercisable 2,500      
$2.20 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 2.20      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 3 years 9 months 18 days      
Options Exercisable 2,500      
$1.20 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 1.20      
Options Outstanding 2,500      
Weighted Average Remaining Contractual Life 4 years      
Options Exercisable 2,500