Note 18 - Summary of Quarterly Results (Unaudited) - Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020
Net Sales		$ 97,015	$ 72,204	$ 76,387	$ 70,006	$ 63,470	$ 71,010	$ 82,377	$ 88,701
Gross profit		22,904	18,092	19,706	18,272	15,769	15,942	19,964	21,855	$ 78,974	$ 73,530
Net Income		$ 198	$ 1,472	$ 2,208	$ 1,990	$ 1,513	$ 1,861	$ 1,743	$ 4,475	$ 5,868	$ 9,592
Basic (in dollars per share)		$ 0.01	$ 0.05	$ 0.08	$ 0.08	$ 0.06	$ 0.07	$ 0.07	$ 0.17	$ 0.22	$ 0.37
Diluted (in dollars per share)		0.01	0.05	0.08	0.07	0.06	0.07	0.07	0.17	$ 0.21	$ 0.36
Maximum [Member]
Share prices (in dollars per share)		9.54	10.78	9.01	7.34	6.81	7.28	6.30	5.22
Minimum [Member]
Share prices (in dollars per share)		$ 7.55	$ 8.09	$ 6.75	$ 5.52	$ 3.51	$ 2.59	$ 4.90	$ 3.63
Fiscal Year [Member]
Net Sales										$ 315,612	$ 305,558
Gross profit										78,974	73,530
Net Income										$ 5,868	$ 9,592
Basic (in dollars per share)	[1]									$ 0.22	$ 0.37
Diluted (in dollars per share)	[1]									0.21	0.36
Fiscal Year [Member] | Maximum [Member]
Share prices (in dollars per share)										10.78	7.28
Fiscal Year [Member] | Minimum [Member]
Share prices (in dollars per share)										$ 5.52	$ 2.59

[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.