Note 17 - Summary of Quarterly Results (Unaudited) - Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019
Net Sales		$ 63,470	$ 71,010	$ 82,377	$ 88,701	$ 81,522	$ 72,832	$ 89,541	$ 84,957
Gross profit		15,769	15,942	19,964	21,855	17,459	15,337	19,656	21,261	$ 73,530	$ 73,713
Net Income (loss)		$ 1,513	$ 1,861	$ 1,743	$ 4,475	$ 862	$ (3,168)	$ (15,782)	$ 1,749	$ 9,592	$ (16,339)
Basic (in dollars per share)		$ 0.06	$ 0.07	$ 0.07	$ 0.17	$ 0.03	$ (0.12)	$ (0.61)	$ 0.07	$ 0.37	$ (0.63)
Diluted (in dollars per share)		0.06	0.07	0.07	0.17	0.03	(0.12)	(0.61)	0.07	$ 0.36	$ (0.63)
Maximum [Member]
Share prices (in dollars per share)		6.81	7.28	6.30	5.22	3.72	3.86	4.63	5.62
Minimum [Member]
Share prices (in dollars per share)		$ 3.51	$ 2.59	$ 4.90	$ 3.63	$ 2.59	$ 2.51	$ 3.15	$ 4.20
Fiscal Year [Member]
Net Sales										$ 305,558	$ 328,852
Gross profit										73,530	73,713
Net Income (loss)										$ 9,592	$ (16,339)
Basic (in dollars per share)	[1]									$ 0.37	$ (0.63)
Diluted (in dollars per share)	[1]									0.36	(0.63)
Fiscal Year [Member] | Maximum [Member]
Share prices (in dollars per share)										7.28	5.62
Fiscal Year [Member] | Minimum [Member]
Share prices (in dollars per share)										$ 2.59	$ 2.51

[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.