Note 17 - Sale of Subsidiary (Details Textual) - USD ($)		3 Months Ended												12 Months Ended
	Sep. 30, 2014	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
Gain (Loss) on Disposition of Business																		$ (565,000)
Revenue, Net		$ 83,419,000	$ 78,156,000	$ 85,658,000	$ 84,159,000	$ 80,844,000	$ 70,740,000	$ 84,687,000	$ 85,925,000	$ 76,073,000	$ 68,603,000	$ 84,715,000	$ 78,466,000	331,392,000	[1]	322,196,000	[1]	307,857,000	[1]	299,463,000	280,790,000
Operating Income (Loss)														$ 3,609,000		$ 13,956,000		$ 7,533,000		$ 2,318,000	$ 630,000
LSI Saco Technologies Inc [Member]
Sale of Stock, Consideration Received on Transaction	$ 1,900,000
Gain (Loss) on Disposition of Business	(565,000)
Line Of Credit Terminated	$ 5,000,000												5,000,000
Revenue, Net													41,000
Operating Income (Loss)													$ (183,000)

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