Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Cash, Ending Balance	$ 13,458	$ 15,582
Accounts Receivable, Credit Loss Expense (Reversal)	200	(100)	$ 500
Construction in Progress, Gross	600	1,900
Impairment of Intangible Assets, Finite-lived	2,800	0	0
Goodwill, Impairment Loss	3,700
Contract with Customer, Asset, after Allowance for Credit Loss, Total	0	0
Contract with Customer, Liability, Total	400	300
Accounts Receivable, Allowance for Credit Loss, Ending Balance	700	700
Advertising Expense	3,600	5,000	5,100
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total	16,900	300	100
Undistributed Earnings of Foreign Subsidiaries	56,400
Research and Development Expense, Total	$ 3,800	$ 3,700	$ 3,600
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares)	86,065	68,378	23,771
Foreign Exchange Contract [Member]
Derivative, Notional Amount	$ 0	$ 0
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Right to Recover Product, Total	100	100
Accrued Expenses [Member]
Contract with Customer, Refund Liability, Total	$ 200	200
Noncompete Agreements [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	8 years
Software Developement [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Minimum [Member] | Patents [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Minimum [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	14 years
Minimum [Member] | Completed Technology [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	8 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Maximum [Member] | Patents [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Maximum [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Maximum [Member] | Completed Technology [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	16 years
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	50 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	12 years
United Kingdom, Pounds
Cash, Ending Balance	$ 4,300	4,600
Brazil, Brazil Real
Cash, Ending Balance	700	2,600
Non-US [Member]
Cash, Ending Balance	$ 7,100	$ 8,900