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Summary of Significant Accounting and Reporting Policies (Schedule of Amortized Cost, Unrealized Gains and Losses, and Market Value of Investment Securities) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 195,025,034 | $ 177,467,550
Unrealized gains | 3,093,114 | 8,260,042
Unrealized losses | (1,818,868) | (561,300)
Market Value | 196,299,280 | 185,166,292
Certificate of Deposit | Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,500,543 | 1,502,187
Unrealized gains | 7,227 | 14,506
Unrealized losses | 0 | 0
Market Value | 1,507,770 | 1,516,693
Certificate of Deposit | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2,001,714 | 3,503,898
Unrealized gains | 54,996 | 141,622
Unrealized losses | 0 | 0
Market Value | 2,056,710 | 3,645,520
Asset-backed Securities | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 26,352,630 | 37,681,113
Unrealized gains | 34,771 | 800,802
Unrealized losses | (587,888) | (557,378)
Market Value | 25,799,513 | 37,924,537
Corporate Bonds | Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,994,639 | 7,084,638
Unrealized gains | 23,801 | 70,962
Unrealized losses | 0 | 0
Market Value | 2,018,440 | 7,155,600
Corporate Bonds | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 40,716,866 | 8,595,020
Unrealized gains | 168,416 | 429,015
Unrealized losses | (530,353) | 0
Market Value | 40,354,929 | 9,024,035
Government Securities | Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 6,635,132
Unrealized gains |  | 43,318
Unrealized losses |  | 0
Market Value |  | 6,678,450
Government Securities | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 48,385,672 |
Unrealized gains | 55,939 |
Unrealized losses | (497,575) |
Market Value | 47,944,036 |
Municipal Bonds | Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 10,160,376
Unrealized gains |  | 124,389
Unrealized losses |  | 0
Market Value |  | 10,284,765
Municipal Bonds | Long-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 72,175,568 | 100,776,325
Unrealized gains | 2,747,964 | 6,635,428
Unrealized losses | (203,052) | (3,922)
Market Value | 74,720,480 | 107,407,831
Other | Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 1,897,402 | 1,528,861
Unrealized gains | 0 | 0
Unrealized losses | 0 | 0
Market Value | $ 1,897,402 | $ 1,528,861

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