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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 |

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- 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 + Details
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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + Details
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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 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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 + Details
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- Definition 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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