Stock Transactions (Schedule Of Options Granted, Outstanding And Exercisable) (Details) - Exercise Price - .435 [Member] - 2005 Plan [Member]	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	20,000
Remaining Contractual Life in Years	5 months 16 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	20,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	1 year 6 months
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	4 years 4 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	100,000
Remaining Contractual Life in Years	3 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	100,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	5 years 6 months
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	100,000
Remaining Contractual Life in Years	7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	100,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	5 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	100,000
Remaining Contractual Life in Years	1 year 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	100,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	6 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	200,000
Remaining Contractual Life in Years	2 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	200,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	7 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	200,000
Remaining Contractual Life in Years	3 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	200,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	8 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares	10,000
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	200,000
Remaining Contractual Life in Years	4 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares
Exercise Price | $ / shares	$ 0.435
Options Outstanding | shares	10,000
Remaining Contractual Life in Years	9 years 7 months 6 days
Average Exercise Price | $ / shares	$ 0.435
Number of Options Currently Exercisable | shares