Stock Options and Warrants (Details) - Stock Options [Member] - USD ($)	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Shares, beginning balance	1,987,000	2,252,000
Shares, granted	0	0
Shares, exercised	0	0
Shares, cancelled/expired		(60,000)
Shares, ending balance	1,987,000	2,192,000
Shares, exercisable	1,987,000	2,192,000
Weighted average exercise price, beginning balance	$ 0.13	$ 0.13
Weighted average exercise price, granted	0.00	0.00
Weighted average exercise price, exercised	0.00	0.00
Weighted average exercise price, cancelled/expired	0.00	0.13
Weighted average exercise price, ending balance	0.13	0.12
Weighted average exercise price, exercisable	$ 0.13	$ 0.12
Aggregate intrinsic value, outstanding	$ 25,000	$ 177,000

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

+ References

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Number of share options (or share units) exercised during the current period.

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