Stock And Stock Options (Schedule Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Stock And Stock Options [Abstract]
Shares, Outstanding beginning of year	30,000	37,500
Shares, Granted
Shares, Exercised
Shares, Expired/cancelled	(13,125)	(7,500)
Shares, Outstanding end of year	16,875	30,000
Weighted Average Exercise Price, Outstanding beginning of year	$ 3.73	$ 4.70
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Expired/cancelled	4.43	8.40
Weighted Average Exercise Price, Outstanding end of year	$ 3.18	$ 3.73
Exercisable, end of year, Shares	16,875	30,000
Exercisable, end of year, Weighted Average Exercise Price	$ 3.18	$ 3.73