Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Long-lived Assets (Details)	12 Months Ended
	Jun. 30, 2018
Building [Member]
Property, plant, and equipment (Year)
Building [Member] | Minimum [Member]
Property, plant, and equipment (Year)	28 years
Building [Member] | Maximum [Member]
Property, plant, and equipment (Year)	40 years
Machinery and Equipment [Member]
Property, plant, and equipment (Year)
Machinery and Equipment [Member] | Minimum [Member]
Property, plant, and equipment (Year)	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, plant, and equipment (Year)	10 years
Software and Software Development Costs [Member]
Property, plant, and equipment (Year)
Software and Software Development Costs [Member] | Minimum [Member]
Property, plant, and equipment (Year)	3 years
Software and Software Development Costs [Member] | Maximum [Member]
Property, plant, and equipment (Year)	8 years