Note 17 - Summary of Quarterly Results (Unaudited) - Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 81,522	$ 72,832	$ 89,541	$ 84,957	$ 83,409	$ 78,843	$ 92,305	$ 87,466
Gross profit	17,459	15,337	19,656	21,261	20,306	19,918	25,307	23,703	$ 73,713	$ 89,234
Net income (loss)	$ 862	$ (3,168)	$ (15,782)	$ 1,749	$ (2,664)	$ 220	$ (1,468)	$ (15,629)	$ (16,339)	$ (19,541)
Basic (in dollars per share)	$ 0.03	$ (0.12)	$ (0.61)	$ 0.07	$ (0.10)	$ (0.01)	$ (0.06)	$ (0.61)	$ (0.63)	$ (0.76)
Diluted (in dollars per share)	0.03	(0.12)	(0.61)	0.07	(0.10)	(0.01)	(0.06)	(0.61)	$ (0.63)	$ (0.76)
Maximum [Member]
Share prices (in dollars per share)	3.72	3.86	4.63	5.62	8.11	8.88	7.49	9.27
Minimum [Member]
Share prices (in dollars per share)	$ 2.59	$ 2.51	$ 3.15	$ 4.20	$ 4.91	$ 6.70	$ 6.07	$ 4.99
Fiscal Year [Member]
Net sales									$ 328,852	$ 342,023
Gross profit									73,713	89,234
Net income (loss)									$ (16,339)	$ (19,541)
Basic (in dollars per share)									$ (0.63)	$ (0.76)	[1]
Diluted (in dollars per share)									(0.63)	(0.76)	[1]
Fiscal Year [Member] | Maximum [Member]
Share prices (in dollars per share)									5.62	9.27
Fiscal Year [Member] | Minimum [Member]
Share prices (in dollars per share)									$ 2.51	$ 4.91

[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. There is no difference between basic and diluted shares due to losses