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Note 4 - Receivables (Tables)
 12 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
    June 30,  
    2017   2016  
    (in thousands)  
Other lessee receivables   $
130
     $
214
    
Accrued interest and dividends    
710
      
1,119
    
Total receivables   $
840
     $
1,333