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Note 6 - Investments (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Summary of Investment Holdings, Schedule of Investments [Table Text Block]
   
December 31,
 
   
2020
   
2019
 
Investment in CoBank stock
  $
1,192
    $
1,192
 
Rental property
   
168
     
194
 
Other miscellaneous
   
94
     
91
 
    $
1,454
    $
1,477