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Note 10 - Credit Quality of Rents Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Summary of Valuation Allowance [Table Text Block]
Allowance for Doubtful Accounts
 
December 31, 2019
   
December 31, 2018
 
Beginning balance
  $
13,000
    $
34,000
 
Accounts receivable (written off)
   
(13,000
)    
(21,000
)
Ending Balance
  $
-
    $
13,000