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Investments - Summary of Net Investment Income, Consisting Primarily of Interest and Dividends (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Marketable Securities [Line Items] |  |  |
Investment income | $ 32,510,185 | $ 29,822,647 | $ 27,584,155
Investment expenses | (2,995,230) | (2,914,991) | (4,056,851)
Net investment income | 29,514,955 | 26,907,656 | 23,527,304
Short-term investments [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Investment income | 1,243,104 | 795,522 | 407,580
Fixed Maturities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Investment income | 29,969,774 | 27,733,555 | 26,143,924
Equity Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Investment income | 1,268,056 | 1,264,120 | 999,335
Other [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Investment income | $ 29,251 | $ 29,450 | $ 33,316

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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