Note 7 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Cost	$ 160,390	$ 163,368
Accumulated Depreciation	(123,300)	(126,689)
Net	37,090	36,679
Land [Member]
Cost	1,186	1,210
Accumulated Depreciation
Net	1,186	1,210
Building and Building Improvements [Member]
Cost	43,641	44,772
Accumulated Depreciation	(29,966)	(30,427)
Net	13,675	14,345
Machinery and Equipment [Member]
Cost	115,563	117,386
Accumulated Depreciation	(93,334)	(96,262)
Net	$ 22,229	$ 21,124

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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