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Note 3 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Allowance for Doubtful Accounts Receivable, Current, Ending Balance $ 960,000 $ 942,000
Cash, Uninsured Amount 320,000 $ 473,000
One Customer [Member]    
Accounts Receivable, Net, Total $ 1,116,000  
Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Number of Major Customers 1  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]    
Concentration Risk, Percentage 31.00%