Note 15 - Restructuring Costs (Details Textual) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 29, 2018 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($) ft²
Inventory Write-down				$ 2,454	$ 3,607
Proceeds from Sale of Property, Plant, and Equipment, Total				20,150	$ 32
Closure of Leased Facility in Hawthorne, California [Member]
Area of Real Estate Property (Square Foot) | ft²					12,000
Restructuring and Related Cost, Incurred Cost (Gain)					$ 100
Inventory Write-down					100
Sell Manufacturing Facility In New Windsor, New York [Member]
Expected Annual Savings from Closure of Facility	$ 4,000
Proceeds from Sale of Property, Plant, and Equipment, Total			$ 12,300
Gain (Loss) on Disposition of Property Plant Equipment, Total			$ 4,800
Closure of Lighting Facility in New Windsor, New York [Member]
Restructuring and Related Cost, Incurred Cost (Gain)					1,700
Inventory Write-down					$ 1,100
Sale of Manufacturing Facility in North Canton, Ohio [Member]
Inventory Write-down				$ 600
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 7,700
Gain (Loss) on Disposition of Property Plant Equipment, Total		$ 3,700