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Major Tenants (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Major Tenants
Tenants
 
Industry
 
2022
 
2021
             
Best Buy Stores, L.P.
 
Retail
$
86,606
$
240,427
Dollar Tree Stores, Inc.
 
Retail
   
0
   
128,262
The Cellular Connection LLC
 
Retail
   
39,156
   
0
Grifols S.A
 
Medical
   
37,071
   
0
Zale Delaware Inc.
 
Retail
   
36,181
   
108,584
Fresenius Medical Care of Illinois
 
Medical
   
105,415
   
102,844
Aggregate rental income of major tenants
   
   
$
304,429
$
580,117
Aggregate rental income of major tenants
as a percentage of total rental income
   
   
   
100%
   
88%