Note 3 - Segment Reporting Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Net Sales	$ 76,387	$ 82,377	$ 146,393	$ 171,078
Operating income (loss)	2,686	1,760	4,888	8,599
Capital expenditures	475	764	880	1,119
Depreciation and amortization	1,990	2,152	4,023	4,551
Segment Reconciling Items [Member]
Operating income (loss)	(2,591)	(2,752)	(5,800)	(6,089)
Capital expenditures	160	162	169	187
Depreciation and amortization	76	117	132	352
Lighting Segment [Member]
Net Sales	45,126	53,436	90,531	116,627
Lighting Segment [Member] | Operating Segments [Member]
Operating income (loss)	2,134	3,150	5,722	12,309
Capital expenditures	275	557	644	887
Depreciation and amortization	1,610	1,661	3,229	3,439
Graphics Segment [Member]
Net Sales	31,261	28,941	55,862	54,451
Graphics Segment [Member] | Operating Segments [Member]
Operating income (loss)	3,143	1,362	4,966	2,379
Capital expenditures	40	45	67	45
Depreciation and amortization	$ 304	$ 374	$ 662	$ 760