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Note 18 - Contracts With Customers (Tables)
12 Months Ended
Jun. 30, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Year ended June 30,
 
Facility
 
201
9

% of

total
revenue
   
201
8

% of

total
revenue
   
201
7

% of

total
revenue
 
El Camino, Los Gatos, & other facilities
   
22.1
%
   
24.2
%
   
22.9
%