Note 18 - Quarterly Financial Data - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ 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, 2018		Jun. 30, 2017		Jun. 30, 2016
Net Sales	$ 57,552	$ 54,834	$ 52,124	$ 51,818	$ 54,253	$ 50,670	$ 53,187	$ 48,913	$ 216,328	[1]	$ 207,023	[2]	$ 209,685	[3]
Gross Margin	18,434	18,072	15,930	16,539	16,735	14,479	16,822	13,914	68,975		61,950		46,988
Earnings Before Income Taxes	791	2,337	1,097	640	(211)	(1,244)	1,517	1,476	4,865		1,538		(20,375)
Net Earnings / (Loss)	$ 825	$ 1,637	$ (6,521)	$ 426	$ (45)	$ (786)	$ 1,063	$ 759	$ (3,633)		$ 991		$ (14,130)
Basic and Diluted Earnings / (Loss) Per Share (in dollars per share)	$ 0.12	$ 0.23	$ (0.93)	$ 0.06	$ (0.01)	$ (0.11)	$ 0.15	$ 0.11	$ (0.52)		$ 0.14

[1] Excludes $6,468 of North American segment intercompany sales to the International segment and $14,239 intercompany sales of the International segment to the North American segment.

[2] Excludes $7,902 of North American segment intercompany sales to the International segment and $11,677 intercompany sales of the International segment to the North American segment.

[3] Excludes $8,259 of North American segment intercompany sales to the International segment and $9,282 intercompany sales of the International segment to the North American segment.