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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Fair Value Financial Instruments
   March 31, 2019  December 31, 2018
   Carrying  Fair  Carrying  Fair
   Amount  Value  Amount  Value
             
Cash and equivalents  $433,504   $433,604   $2,183,441   $2,183,441 
Accounts receivable   253,639    253,639    251,535    251,535 
Interest receivable   189,694    189,694    184,869    184,869 
Mortgage loans receivable   21,990,821    23,401,582    23,607,655    23,905,564 
Bond portfolio   16,710,937    16,202,937    15,847,807    15,389,807 
Secured investor certificates   27,551,000    31,695,185    29,386,000    34,099,540