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Stock Options and Warrants (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2017
Stock Options and Warrants (Textual)
Stock compensation expense	$ 308,000	$ 378,000
Unrecognized compensation cost related to non-vested stock option awards	$ 80,000
Unrecognized compensation cost related to non-vested stock option awards, period	8 months 12 days
Aggregate intrinsic per share	$ 1.23
Intrinsic value	$ 269,000
Fair value of shares vested	$ 237,000	$ 1,210,000
Minimum [Member]
Stock Options and Warrants (Textual)
Estimated option term	2 years 6 months	4 years 10 months 25 days
Maximum [Member]
Stock Options and Warrants (Textual)
Estimated option term	4 years	6 years 9 months 18 days
Additional Paid-In Capital
Stock Options and Warrants (Textual)
Stock compensation expense	$ 308,000	$ 378,000
Stock option [Member]
Stock Options and Warrants (Textual)
Plan authorized			1,200,000
Granted during the period, options	560,000	613,000
Intrinsic value	$ 0
Options exercisable in-the-money	205,000	1,206,000
Weighted-average grant date fair value per share	$ 0.64	$ 0.50
Risk free interest rate, minimum	0.22%	1.87%
Risk free interest rate, maximum	1.61%	2.60%
Expected volatility factor, minimum	71.50%	65.80%
Expected volatility factor, maximum	75.40%	72.40%
Expected dividend yield	0.00%	0.00%

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Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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