Note 18 - 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, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	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, 2018		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2014
Net sales	$ 83,409	$ 78,843	$ 92,305	$ 87,466	$ 83,419	$ 78,156	$ 85,658	$ 84,159	$ 80,844	$ 70,740	$ 84,687	$ 85,925	$ 342,023		$ 331,392		$ 322,196		$ 307,857	$ 299,463
Cost of products and services sold													252,789		248,012		238,525		233,408	234,165
Restructuring costs (in cost of sales)															1,503
Loss on sale of a subsidiary																			565
(Gain) loss on sale of a building															(1,361)				(343)
Acquisition deal costs															1,608
Transition and Realignment Costs													3,136
Restructuring costs (in SG&A)															(1,091)
Selling and administrative expenses													79,750		77,272		69,715		66,694	62,175
Goodwill and intangible asset impairment													28,000		479					805
Operating income													(21,652)		3,609		13,956		7,533	2,318
Interest (income)													(39)		(91)		(84)		(26)	(17)
Interest expense													1,719		620		36		45	68
(Loss) income before income taxes													(23,332)		3,080		14,004		7,514	2,267
Income taxes													(3,791)		80		4,522		2,363	1,337
Net income (loss)	$ (2,664)	$ 220	$ (1,468)	$ (15,629)	$ 696	$ (531)	$ 2,006	$ 829	$ 1,428	$ 522	$ 3,782	$ 3,750	$ (19,541)		$ 3,000		$ 9,482		$ 5,151	$ 930
Basic (in dollars per share)	$ (0.10)	$ (0.01)	$ (0.06)	$ (0.61)	$ 0.03	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ (0.76)		$ 0.12		$ 0.38		$ 0.21	$ 0.04
Diluted (in dollars per share)	$ (0.10)	$ (0.01)	$ (0.06)	$ (0.61)	$ 0.03	$ (0.02)	$ 0.08	$ 0.03	$ 0.06	$ 0.02	$ 0.15	$ 0.15	(0.76)		0.12		0.37		0.21	0.04
Cash dividends paid per share (in dollars per share)													$ 0.20		$ 0.20		$ 0.17		$ 0.12	$ 0.24
Basic (in shares)													25,866		25,436		24,988		24,496	24,388
Diluted (in shares)													25,866	[1]	25,988	[1]	25,592	[1]	24,638	24,546
Working capital	$ 67,882				$ 61,704				$ 88,510				$ 67,882		$ 61,704		$ 88,510		$ 80,813	$ 74,349
Total assets	229,517				256,680				195,560				229,517		256,680		195,560		180,690	168,688
Long-term debt	45,360				49,698								45,360		49,698
Shareholders’ equity	$ 139,251				$ 160,078				$ 155,520				$ 139,251		$ 160,078		$ 155,520		$ 142,952	$ 138,412

[1] Options to purchase 2,802,420 common shares, 1,698,883 common shares, and 1,331,300 common shares at June 30, 2018, 2017, and 2016, 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. For the year ended June 30, 2018 the effect of dilutive securities was not included in the calculation of diluted earnings (loss) per share because there was a net operating loss for the period.