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3) Investments: Residential Real Estate Investment (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) $ 124,578,839 $ 141,298,706
Residential Real Estate 1    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 31,111,447 68,329,917
Residential Real Estate 1 | Arizona    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017)   217,105
Residential Real Estate 1 | California    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 4,955,551 5,463,878
Residential Real Estate 1 | Florida    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 6,792,934 7,000,684
Residential Real Estate 1 | Hawaii    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 712,286 712,286
Residential Real Estate 1 | Ohio    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017)   10,000
Residential Real Estate 1 | Oklahoma    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017)   17,500
Residential Real Estate 1 | Texas    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 553,550 509,011
Residential Real Estate 1 | Utah    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 17,460,770 54,113,272
Residential Real Estate 1 | Virginia    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) 150,175  
Residential Real Estate 1 | Washington    
Real estate held for investment (net of accumulated depreciation of $16,240,453 and $18,788,869 for 2018 and 2017) $ 476,181 $ 286,181