Note 9 - Impairment of Assets and Restructuring Costs (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Impairment of Long-Lived Assets Held-for-use			$ 4,114,000
Property, Plant and Equipment, Net, Ending Balance	36,514,000	39,345,000
Restructuring Charges, Total		$ 988,000
Vacated Facility at Mt. Airy, North Carolina [Member]
Impairment of Long-Lived Assets Held-for-use			$ 4,100,000
Property, Plant and Equipment, Net, Ending Balance	2,000,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 100,000