Note 16 - Acquisition (Details Textual) - USD ($)		3 Months Ended	4 Months Ended	12 Months Ended
	Feb. 21, 2017	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax				$ 6,857,000	$ 18,010,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Business Combination, Acquisition Related Costs				1,608,000
Atlas Lighting Products, Inc. [Member]
Business Combination, Consideration Transferred	97,500,000
Payments to Acquire Businesses, Gross	$ 96,900,000
Number of Stock Warrants Issued	200,000	200,000
Warrant Term	5 years
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 1,800,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax				6,900,000
Business Combination, Inventory, Fair Value Adjustment	$ 228,000
Business Combination, Property, Plant, and Equipment, Fair Value Adjustment	526,000
Business Combination, Acquisition Related Costs				$ 1,480,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			$ 17,800,000
Atlas Lighting Products, Inc. [Member] | Line of Credit [Member]
Business Combination, Consideration Transferred, Liabilities Incurred	66,000,000
Atlas Lighting Products, Inc. [Member] | Warrant [Member]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 600,000