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Fair Value Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2020
Notes to Financial Statements  
Fair Value Company's Financial Instruments
  September 30, 2020 December 31, 2019
  Carrying Fair Carrying Fair
  Amount Value Amount Value
         
Cash and equivalents $     269,401 $    269,401 $     191,987 $    191,987
Accounts receivable 109,612 109,612 125,539 125,539
Interest receivable 179,747 179,747 185,190 185,190
Mortgage loans receivable 18,462,121 23,108,195 22,425,177 24,573,176
Bond portfolio 18,284,135 18,284,135 16,055,937 16,055,937
Secured investor certificates 24,158,250 29,896,202 26,850,000 32,389,253