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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Derivative Asset, Total	$ 0	$ 1,400,000
Provision for Doubtful Accounts	500,000	300,000	$ 300,000
Construction in Progress, Gross	1,200,000	1,600,000
Impairment of Long-Lived Assets Held-for-use			4,114,000
Advertising Expense	5,100,000	5,200,000	5,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total	100,000	200,000	17,800,000
Undistributed Earnings of Foreign Subsidiaries	55,400,000
Research and Development Expense, Total	$ 3,600,000	$ 3,500,000	$ 2,900,000
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total	23,771	32,674	32,833
Noncompete Agreements [Member]
Finite-Lived Intangible Asset, Useful Life	8 years
Software Developement [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member] \| Patents [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Minimum [Member] \| Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life	14 years
Minimum [Member] \| Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	8 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] \| Patents [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Maximum [Member] \| Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] \| Completed Technology [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum [Member] \| Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	16 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life	10 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life	50 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life	12 years