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Schedule of Other Stock Options Issued (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding, beginning of year | 3,611,850 | 4,303,900
Options exercised | (383,350) | (31,276)
Options expired | (20,000) | (765,000)
Options outstanding, end of year | 3,516,225 | 3,611,850
Other Options Issued [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding, beginning of year | 265,000 | 625,000
Options issued | 90,000 | 265,000
Options exercised | (10,625) |
Options expired |  | (625,000)
Options outstanding, end of year | 344,375 | 265,000

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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