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Note 11 - Contracts With Customers (Tables)
6 Months Ended
Dec. 31, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Six Months Ended December 31,
Facility
 
2019
% of
total
revenue
   
2018
% of
total
revenue
El Camino, Los Gatos, & other facilities
   
23.60
%
   
22.26