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Stock And Stock Options (Schedule Of Stock Option Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock And Stock Options [Abstract]      
Shares, Outstanding beginning of year 37,500 45,625 90,025
Shares, Granted 2,500 10,000
Shares, Exercised
Shares, Expired/cancelled (7,500) (10,625) (54,400)
Shares, Outstanding end of year 30,000 37,500 45,625
Weighted Average Exercise Price, Outstanding beginning of year $ 4.70 $ 6.10 $ 5.70
Weighted Average Exercise Price, Granted 1.20 2.40
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Expired/cancelled 8.40 9.88 4.80
Weighted Average Exercise Price, Outstanding end of year $ 3.73 $ 4.70 $ 6.10
Exercisable, end of year, Shares 30,000 37,500 45,625
Exercisable, end of year, Weighted Average Exercise Price $ 3.73 $ 4.70 $ 6.10