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Note I - Commitments (Tables)
12 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
201
9
   
20
20
   
202
1
   
202
2
   
202
3
   
There-
after
   
Total
 
Gross minimum rental commitments
  $
2,796
    $
2,794
    $
2,829
    $
2,864
    $
2,901
    $
2,547
    $
16,731