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Note 17 - Acquisition (Details Textual) - USD ($)
4 Months Ended 12 Months Ended
Feb. 21, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000,000            
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Before Tax       $ 6,857,000 $ 18,010,000    
Business Combination, Acquisition Related Costs     1,608,000
Atlas Lighting Products, Inc. [Member]              
Business Combination, Consideration Transferred, Total 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, Inventory, Fair Value Adjustment $ 228,000            
Business Combination, Property, Plant, and Equipment, Fair Value Adjustment 526,000            
Business Acquisition, Transaction Costs   $ 1,480,000   1,480,000      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   17,800,000          
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, Acquisition Related Costs       $ 1,610,000      
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