Stock Plans and Stock Based Compensation (Schedule of Stock Option Activity) (Details) - 2006 Plan [Member]	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Summary of stock options activity
Options Outstanding, Beginning balance | shares	6,301,500
Options Outstanding, Ending balance | shares	6,301,500
Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 0.06
Options Outstanding, Weighted Average Exercise Price, Ending balance	0.06
Options Outstanding, Weighted Average Fair Value, Beginning balance	0.06
Options Outstanding, Weighted Average Fair Value, Ending balance	$ 0.06
Options Outstanding, Weighted Average Remaining Contractual Life, Beginning balance	4 years 11 months 23 days
Options Outstanding, Weighted Average Remaining Contractual Life, Ending balance	4 years 8 months 26 days
Options Exercisable, Beginning balance | shares	6,301,500
Options Exercisable, Ending balance | shares	6,301,500
Options Exercisable, Weighted Average Exercise Price, Beginning balance	$ 0.06
Options Exercisable, Weighted Average Exercise Price, Ending balance	0.06
Options Exercisable, Weighted Average Fair Value, Beginning balance	0.06
Options Exercisable, Weighted Average Fair Value, Ending balance	$ 0.06
Options Exercisable, Weighted Average Remaining Contractual Life, Beginning balance	4 years 11 months 23 days
Options Exercisable, Weighted Average Remaining Contractual Life, Ending balance	4 years 8 months 26 days