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3) Investments: Residential Real Estate Investment (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Real estate held for investment (net of accumulated depreciation) $ 119,469,347 $ 121,558,222
Residential Real Estate    
Real estate held for investment (net of accumulated depreciation) 26,386,608 29,507,431
Residential Real Estate | California    
Real estate held for investment (net of accumulated depreciation) 1,911,458 2,644,321
Residential Real Estate | Florida    
Real estate held for investment (net of accumulated depreciation) 5,645,131 6,534,277
Residential Real Estate | Ohio    
Real estate held for investment (net of accumulated depreciation) 10,000 10,000
Residential Real Estate | South Carolina    
Real estate held for investment (net of accumulated depreciation) 205,000 0
Residential Real Estate | Tennessee    
Real estate held for investment (net of accumulated depreciation) 105,260 105,260
Residential Real Estate | Texas    
Real estate held for investment (net of accumulated depreciation) 0 139,174
Residential Real Estate | Utah    
Real estate held for investment (net of accumulated depreciation) 18,033,578 19,598,218
Residential Real Estate | Washington    
Real estate held for investment (net of accumulated depreciation) $ 476,181 $ 476,181