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Account Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Accounts Receivable
   December 31,
   2019  2018
       
Trade  $129,000   $118,000 
Accrued receivable   2,826,000    2,512,000 
Qualified Intermediary   250,000    —   
    3,205,000    2,630,000 
Less: Allowance for losses   (15,000)   (15,000)
   $3,190,000   $2,615,000