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Schedule of Activity of Stock Option Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Common Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares, outstanding, beginning |  | 1,072,863 | 1,086,053
Weighted average exercise price, outstanding, beginning |  | $ 4.12 | $ 4.20
Number of Shares, adjustment for effect of stock dividends |  | 47,594 | 27,968
Number of shares, granted |  | 89,500 | 77,000
Number of shares, exercised |  | (183,935) | (116,487)
Number of shares, cancelled |  | (1,671) | (1,671)
Weighted average exercise price, outstanding, ending |  | $ 4.61 | $ 4.12
Number of shares, outstanding, ending |  | 1,024,351 | 1,072,863
Number of shares, options exercisable |  | 934,851 |
Weighted average exercise price, options exercisable |  | $ 4.23 |
Number of shares, available options for future grant |  | 232,376 |
Weighted average contractual term of options outstanding |  | 4 years 6 months 14 days |
Weighted average contractual term of options exercisable |  | 4 years 10 days |
Aggregated intrinsic value of options outstanding | [1] | $ 4,700,708 |
Aggregated intrinsic value of options exercisable | [1] | $ 4,648,798 |
Common Class C [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares, outstanding, beginning |  | 662,666 | 594,132
Weighted average exercise price, outstanding, beginning |  | $ 4.50 | $ 5.10
Number of Shares, adjustment for effect of stock dividends |  | 33,136 | 19,354
Number of shares, granted |  | 230,000 | 180,000
Number of shares, exercised |  | (104,656) | (130,820)
Number of shares, cancelled |  |  |
Weighted average exercise price, outstanding, ending |  | $ 5.48 | $ 4.50
Number of shares, outstanding, ending |  | 821,146 | 662,666
Number of shares, options exercisable |  | 591,146 |
Weighted average exercise price, options exercisable |  | $ 4.26 |
Number of shares, available options for future grant |  | 16,689 |
Weighted average contractual term of options outstanding |  | 7 years 2 months 26 days |
Weighted average contractual term of options exercisable |  | 6 years 7 months 13 days |
Aggregated intrinsic value of options outstanding | [1] | $ 3,009,168 |
Aggregated intrinsic value of options exercisable | [1] | $ 2,918,768 |
[1] | The Company used a stock price of $9.20 as of December 31, 2021 to derive intrinsic value.

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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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=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=120381028&loc=d3e5070-113901 + Details
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