| Note 5 - Property, Plant and Equipment | 12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jun. 30, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes To Financial Statements [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, Plant and Equipment | Property, plant and equipment, net consist of the following: 
 
 
 Depreciation expense was approximately $57,000 and $40,000, for the years ended June 30, 2018 and 2017, respectively, and is included in selling and administrative expenses in the accompanying consolidated statements of operations. 
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