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Note 9 - Asset Retirement Obligation (Tables)
12 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
   
Year Ended June 30,
 
   
2018
   
2017
 
Beginning balance
  $
561
    $
580
 
Accretion of discount
   
29
     
29
 
Gain on change in ARO estimate
   
-
     
(48
)
Ending balance
  $
590
    $
561