Stock Transactions (Schedule Of Stock Options Outstanding And Activity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding, beginning	970,001	1,026,670
Granted	210,000	210,000
Exercised
Forfeited/expired	180,001	266,669
Outstanding, end	1,000,000	970,001
Vested/exercisable	790,000	760,001
Weighted Average Exercise Price
Outstanding, beginning	$ 0.435	$ 0.435
Granted	0.435	0.435
Exercised
Forfeited/expired	0.435	0.435
Outstanding, end	0.435	0.435
Vested/exercisable	0.435	0.435
Weighted Average Fair Value
Outstanding, beginning	0.308	0.345
Granted	0.210	0.210
Exercised
Forfeited/expired	0.283	0.371
Outstanding, end	0.284	0.308
Vested/exercisable	$ 0.314	$ 0.336
Weighted Average Remaining Contractual Term (Years)
Outstanding, beginning	2 years 9 months 7 days	2 years 5 months 12 days
Granted	4 years 10 months 2 days	6 years 6 months 7 days
Outstanding, end	2 years 10 months 17 days	2 years 9 months 7 days
Vested/exercisable	2 years 4 months 10 days	2 years 2 months 12 days
Intrinsic Value
Outstanding, beginning	$ (272,570)	$ 87,267
Granted	(64,050)	(59,010)
Exercised
Forfeited/expired	54,900	74,934
Outstanding, end	(305,000)	(272,570)
Vested/exercisable	$ (240,950)	$ (213,560)