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Equity Plan - Information Related to the Equity Plans for each of the Last Three Years (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Information Related to the Equity Plans |  |  |
Cash received from option exercise | $ 1,714,000 | $ 1,626,000 | $ 2,667,000
Options |  |  |
Information Related to the Equity Plans |  |  |
Intrinsic value of options exercised | 2,258,245 | 1,618,615 | 1,844,909
Cash received from option exercise | 1,713,737 | 1,626,113 | 2,667,305
Tax benefit realized from option exercises | $ 63,124 | $ 258,037 | $ 534,638
Weighted average fair value of options granted (in dollars per share) | $ 1.15 | $ 1.91 | $ 3.03

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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