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Investments (Schedule of Amortized Cost, Unrealized Gains and Losses, and Market Value of Investment Securities) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 194,091,465 | $ 177,467,550
Unrealized Gains | 4,526,340 | 8,260,042
Unrealized Losses | (1,058,070) | (561,300)
Market Value | 197,559,735 | 185,166,292
Short-Term Investments | Certificate of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,750,589 | 1,502,187
Unrealized Gains | 14,441 | 14,506
Unrealized Losses | 0 | 0
Market Value | 1,765,030 | 1,516,693
Short-Term Investments | Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,992,456 | 7,084,638
Unrealized Gains | 40,204 | 70,962
Unrealized Losses | 0 | 0
Market Value | 2,032,660 | 7,155,600
Short-Term Investments | Government Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 6,635,132
Unrealized Gains |  | 43,318
Unrealized Losses |  | 0
Market Value |  | 6,678,450
Short-Term Investments | Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,334,020 | 10,160,376
Unrealized Gains | 848 | 124,389
Unrealized Losses | 0 | 0
Market Value | 1,334,868 | 10,284,765
Short-Term Investments | Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,803,989 | 1,528,861
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 1,803,989 | 1,528,861
Long-Term Investments | Asset Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 28,223,803 | 37,681,113
Unrealized Gains | 80,480 | 800,802
Unrealized Losses | (564,592) | (557,378)
Market Value | 27,739,691 | 37,924,537
Long-Term Investments | Certificate of Deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2,002,082 | 3,503,898
Unrealized Gains | 71,573 | 141,622
Unrealized Losses | 0 | 0
Market Value | 2,073,655 | 3,645,520
Long-Term Investments | Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 32,791,105 | 8,595,020
Unrealized Gains | 300,347 | 429,015
Unrealized Losses | (246,410) | 0
Market Value | 32,845,042 | 9,024,035
Long-Term Investments | Government Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 39,704,080 |
Unrealized Gains | 9,126 |
Unrealized Losses | (117,073) |
Market Value | 39,596,133 |
Long-Term Investments | Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 84,489,341 | 100,776,325
Unrealized Gains | 4,009,321 | 6,635,428
Unrealized Losses | (129,995) | (3,922)
Market Value | $ 88,368,667 | $ 107,407,831

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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