Note 17 - Summary of Quarterly Results (Unaudited) - Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2012
Fiscal Year [Member] | Maximum [Member]
High (in dollars per share)	$ 13.45				$ 10.24				$ 9.67				$ 13.45		$ 10.24		$ 9.67
Fiscal Year [Member] | Minimum [Member]
High (in dollars per share)	7.89				5.61				6.65				$ 7.89		$ 5.61		$ 6.65
Fiscal Year [Member]
Net Sales													$ 322,196		$ 307,857		$ 299,463
Gross profit													83,671		74,449		65,298
Net income													$ 9,482		$ 5,151		$ 930
Basic (in dollars per share)													$ 0.38		$ 0.21		$ 0.04	[1]
Diluted (in dollars per share)													0.37		0.21		0.04	[1]
Maximum [Member]
High (in dollars per share)	13.45	$ 12.22	$ 12.80	$ 10.48	10.24	$ 9.17	$ 7.70	$ 8.49	8.78	$ 9.67	$ 9.60	$ 9	13.45		10.24		8.78
Minimum [Member]
High (in dollars per share)	$ 10.29	$ 9.85	$ 7.89	$ 8.33	$ 8.02	$ 5.84	$ 5.61	$ 6	$ 7.10	$ 7.54	$ 7.76	$ 6.65	$ 10.29		$ 8.02		$ 7.10
Net Sales	$ 80,844	$ 70,740	$ 84,687	$ 85,925	$ 76,073	$ 68,603	$ 84,715	$ 78,466	$ 73,858	$ 68,996	$ 76,123	$ 80,486	$ 322,196	[2]	$ 307,857	[2]	$ 299,463	[2]	$ 280,790	$ 268,402
Gross profit	19,847	16,549	23,926	23,349	18,981	16,305	20,555	18,608	15,704	13,715	16,757	19,122	83,671		74,449		65,298
Net income	$ 1,428	$ 522	$ 3,782	$ 3,750	$ 1,643	$ 393	$ 1,588	$ 1,527	$ (796)	$ (1,009)	$ 870	$ 1,865	$ 9,482		$ 5,151		$ 930		$ (123)	$ 3,224
Basic (in dollars per share)	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ 0.07	$ 0.02	$ 0.06	$ 0.06	$ (0.03)	$ (0.04)	$ 0.04	$ 0.08	$ 0.38		$ 0.21		$ 0.04		$ (0.01)	$ 0.13
Diluted (in dollars per share)	$ 0.06	$ 0.02	$ 0.15	$ 0.15	$ 0.07	$ 0.02	$ 0.06	$ 0.06	$ (0.03)	$ (0.04)	$ 0.04	$ 0.08	$ 0.37		$ 0.21		$ 0.04		$ (0.01)	$ 0.13

[1] The total of the earnings per share for each of the four quarters does not equal the total earnings per share for the full year because the calculations are based on the average shares outstanding during each of the individual periods.

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