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Shareholders' Equity (Schedule of Shares Authorized Under Equity Compensation Plans, By Exercise Price) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number outstanding as of end of year	719,067	533,484
$2.00 - $2.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, minimum	$ 2.00
Range of exercise prices, maximum	$ 2.00
Number outstanding as of end of year	237,500
Options outstanding, weighted average remaining contractual life	5 years 9 months 14 days
Options outstanding, weighted average exercise price	$ 2.00
Number exercisable as of end of year	3,500
Options exerciseable, weighted average exercise price	$ 2.00
2.46 - 2.46
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, minimum	2.46
Range of exercise prices, maximum	$ 2.46
Number outstanding as of end of year	350,000
Options outstanding, weighted average remaining contractual life	1 year 3 days
Options outstanding, weighted average exercise price	$ 2.46
Number exercisable as of end of year	350,000
Options exerciseable, weighted average exercise price	$ 2.46
2.79- 6.05
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, minimum	2.79
Range of exercise prices, maximum	$ 6.05
Number outstanding as of end of year	131,567
Options outstanding, weighted average remaining contractual life	2 years 7 months 2 days
Options outstanding, weighted average exercise price	$ 3.67
Number exercisable as of end of year	105,150
Options exerciseable, weighted average exercise price	$ 3.54
$2.00 - $6.05
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, minimum	2.00
Range of exercise prices, maximum	$ 6.05
Number outstanding as of end of year	719,067
Options outstanding, weighted average remaining contractual life	2 years 10 months 17 days
Options outstanding, weighted average exercise price	$ 2.53
Number exercisable as of end of year	458,650
Options exerciseable, weighted average exercise price	$ 2.70

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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