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Note 13 - Additional Cash Flow Information
 12 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Cash Flow, Supplemental Disclosures [Text Block]
13.
ADDITIONAL CASH FLOW INFORMATION
 
The net changes in cash as a result of changes in operating assets and liabilities consist of the following: 
   
2019
   
2018*
 
Accounts receivable
   $
1,031,180
     $
(773,330
 )
Inventories
    
(712,769
 )    
2,206,664
  
Prepaid expenses and other current assets
    
72,887
      
(381
 )
Income taxes receivable
    
(13,285
 )    
439
  
Accounts payable
    
6,882
      
(813,619
 )
Accrued liabilities
    
(138,448
 )    
30,834
  
Net change
   $
246,447
     $
650,607
  
                 
Net cash paid
(refunded)
during the year for:
                
Income taxes
   $
1,620
     $
3,182
  
Interest expense
   $
-
     $
5,218
  
 
 
*As adjusted for retrospective adoption of ASC
606
and ASC
842