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3) Investments: Schedule of Major categories of net investment income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Gross investment income | $ 16,287,935 | $ 13,757,989 | $ 32,968,164 | $ 27,207,158
Investment Income, Investment Expense | (3,325,190) | (3,217,154) | (6,604,920) | (6,624,655)
Net investment income | 12,962,745 | 10,540,835 | 26,363,244 | 20,582,503
Fixed Maturities |  |  |  |
Gross investment income | 3,143,072 | 2,528,689 | 6,067,786 | 5,032,554
Equity Securities |  |  |  |
Gross investment income | 111,122 | 74,730 | 203,164 | 152,651
Mortgage Loans Real Estate |  |  |  |
Gross investment income | 5,582,152 | 4,525,817 | 11,236,042 | 8,629,184
Real Estate |  |  |  |
Gross investment income | 2,787,881 | 2,096,927 | 5,941,267 | 4,007,221
Policy Student and Other Loans |  |  |  |
Gross investment income | 257,527 | 106,905 | 491,492 | 195,042
Insurance Assignments |  |  |  |
Gross investment income | 4,383,398 | 3,906,832 | 8,682,602 | 8,118,952
Other Investments {1} |  |  |  |
Gross investment income | 398 | 52,130 | 25,421 | 106,678
Cash and Cash Equivalents |  |  |  |
Gross investment income | $ 22,385 | $ 465,959 | $ 320,390 | $ 964,876

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