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Investments - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Nov. 30, 2013 USD ($) | Dec. 31, 2019 USD ($) Securities | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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) |  | $ 1,200,000 |  |
Accumulated other comprehensive loss |  | 504,170 | $ (14,228,059) |
Impairment losses |  | 0 | 0 | $ 0
Sales or transfers, held to maturity |  | 0 | 0 | 0
Derivative instruments or hedging activities |  | 0 | 0 | $ 0
Amortized cost of fixed maturities on deposit with various regulatory authorities |  | 8,330,651 | 8,795,334 |
Unrealised Gains on Equity Securities |  | 12,179,912 | 4,817,917 |
Unrealised Loss on Equity Securities |  | 121,492 | 2,093,624 |
Equity [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Unrealised Gains on Equity Securities |  | 8,900,000 | 1,200,000 |
Unrealised Loss on Equity Securities |  | 25,751 | 4,400,000 |
Obligations of States and Political Subdivisions [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Aggregate fair value of bond held |  | 182,000,000 | 157,700,000 |
Amortized cost of bond held |  | 172,300,000 | 152,200,000 |
Special Revenue Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Aggregate fair value of bond held |  | 93,400,000 | 84,300,000 |
Amortized cost of bond held |  | $ 87,500,000 | $ 80,900,000 |
Education Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of investments in special revenue bonds |  | 44.00% | 49.00% |
Water and Sewer Utility Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of investments in special revenue bonds |  | 35.00% | 29.00% |
Fixed Maturities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Number of fixed maturity securities classified as available for sale | Securities |  | 136 |  |
Accumulated Net Unrealized Investment Losses [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Accumulated other comprehensive loss |  | $ 7,500,000 | $ 8,600,000 |
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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