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Investments - Additional Information (Detail) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2013 USD ($) | Jun. 30, 2021 USD ($) Securities | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Net unrealized losses arising prior to reclassification date | $ 15,100,000 |  |  |
Amortization of unrealized losses recorded in accumulated other comprehensive income (loss) |  | $ 556,553 | $ 833,690 |
Accumulated other comprehensive loss |  | 8,473,471 |  | $ 11,130,612
Gain on equity securities |  | 6,100,000 | 4,900,000 |
Loss on equity securities |  | 114,339 | $ 3,400,000 |
Obligations of States and Political Subdivisions [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Aggregate fair value of bond held |  | 267,800,000 |  | 263,600,000
Amortized cost of bond held |  | 254,200,000 |  | 247,500,000
Special Revenue Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Aggregate fair value of bond held |  | 159,700,000 |  | 140,800,000
Amortized cost of bond held |  | $ 151,700,000 |  | $ 131,100,000
Education Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of investments in special revenue bonds |  | 46.00% |  | 44.00%
Water and Sewer Utility Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of investments in special revenue bonds |  | 35.00% |  | 39.00%
Fixed Maturities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of fixed maturity securities classified as available for sale | Securities |  | 89 |  |
Accumulated Net Unrealized Investment Losses [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Accumulated other comprehensive loss |  | $ 5,500,000 |  | $ 6,100,000
Minimum [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of which the company held security of any issuer |  | 10.00% |  | 10.00%

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