Note 19 - Summary of Quarterly Results (Unaudited) - Statement of Operations Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2013
Net sales	$ 83,419	$ 78,156	$ 85,658	$ 84,159	$ 80,844	$ 70,740	$ 84,687	$ 85,925	$ 76,073	$ 68,603	$ 84,715	$ 78,466	$ 331,392	[1]	$ 322,196	[1]	$ 307,857	[1]	$ 299,463	$ 280,790
Cost of products and services sold													248,012		238,525		233,408		234,165	220,380
Restructuring costs													1,503
Loss on sale of subsidiary																	565
Gain on sale of building													(1,361)				(343)
Acquisition deal costs													1,608
Restructuring costs (in SG&A)													(1,091)
Selling and administrative expenses													77,272		69,715		66,694		62,175	57,367
Impairment of intangible asset													479						805	2,413
Operating income (loss)													3,609		13,956		7,533		2,318	630
Interest (income)													(91)		(84)		(26)		(17)	(47)
Interest expense													620		36		45		68	62
Income before income taxes													3,080		14,004		7,514		2,267	615
Income tax expense													80		4,522		2,363		1,337	738
Net income	$ 696	$ (531)	$ 2,006	$ 829	$ 1,428	$ 522	$ 3,782	$ 3,750	$ 1,643	$ 393	$ 1,588	$ 1,527	$ 3,000		$ 9,482		$ 5,151		$ 930	$ (123)
Basic (in dollars per share)	$ 0.03	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ 0.07	$ 0.02	$ 0.06	$ 0.06	$ 0.12		$ 0.38		$ 0.21		$ 0.04	$ (0.01)
Diluted (in dollars per share)	$ 0.03	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ 0.07	$ 0.02	$ 0.06	$ 0.06	0.12		0.37		0.21		0.04	(0.01)
Dividends, per share (in dollars per share)													$ 0.20		$ 0.17		$ 0.12		$ 0.24	$ 0.36
Basic (in shares)													25,436		24,988		24,496		24,388	24,313
Diluted (in shares)													25,988	[2]	25,592	[2]	24,638	[2]	24,546	24,313
Working capital	$ 61,704				$ 88,510				$ 80,813				$ 61,704		$ 88,510		$ 80,813		$ 74,349	$ 74,647
Total assets	256,680				195,560				180,690				256,680		195,560		180,690		168,688	169,179
Long-Term Debt	49,698												49,698
Shareholders’ equity	$ 160,078				$ 155,520				$ 142,952				$ 160,078		$ 155,520		$ 142,952		$ 138,412	$ 141,690

[1] Net sales are attributed to geographic areas based upon the location of the operation making the sale.

[2] Options to purchase 1,331,300 common shares, 1,331,300 common shares, and 1,882,722 common shares at June 30, 2017, 2016, and 2015, respectively, were not included in the computation of diluted earnings per share because the exercise price was greater than the average fair market value of the common shares.