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4. Investment Securities (Details 3)
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
integer
Dec. 31, 2018
USD ($)
integer
Available for sale - fair value less than 12 months $ 3,844,326 $ 6,716,925
Available for sale - unrealized loss less than 12 months 4,075 55,109
Available for sale - fair value 12 months or more 7,901,158 27,621,835
Available for sale - unrealized loss 12 months or more $ 61,061 $ 779,990
Available for sale - number of securities | integer 23 61
Available for sale - fair value $ 11,745,484 $ 34,338,760
Available for sale - unrealized loss 65,136 835,099
U.S. GSE debt securities    
Available for sale - fair value less than 12 months 1,999,231 1,465,947
Available for sale - unrealized loss less than 12 months 769 6,752
Available for sale - fair value 12 months or more 1,990,336 11,284,761
Available for sale - unrealized loss 12 months or more $ 9,664 $ 252,639
Available for sale - number of securities | integer 2 11
Available for sale - fair value $ 3,989,567 $ 12,750,708
Available for sale - unrealized loss 10,433 259,391
Agency mortgage-backed securities (Agency MBS)    
Available for sale - fair value less than 12 months 1,845,095 2,317,838
Available for sale - unrealized loss less than 12 months 3,306 22,029
Available for sale - fair value 12 months or more 5,662,969 12,223,386
Available for sale - unrealized loss 12 months or more $ 51,250 $ 427,039
Available for sale - number of securities | integer 18 24
Available for sale - fair value $ 7,508,064 $ 14,541,224
Available for sale - unrealized loss 54,556 449,068
ABS and OAS    
Available for sale - fair value less than 12 months   976,226
Available for sale - unrealized loss less than 12 months   6,242
Available for sale - fair value 12 months or more   0
Available for sale - unrealized loss 12 months or more   $ 0
Available for sale - number of securities | integer   1
Available for sale - fair value   $ 976,226
Available for sale - unrealized loss 0 6,242
Other investments    
Available for sale - fair value less than 12 months 0 1,956,914
Available for sale - unrealized loss less than 12 months 0 20,086
Available for sale - fair value 12 months or more 247,853 4,113,688
Available for sale - unrealized loss 12 months or more $ 147 $ 100,312
Available for sale - number of securities | integer 3 25
Available for sale - fair value $ 247,853 $ 6,070,602
Available for sale - unrealized loss $ 147 $ 120,398