Note 15 - Restructuring Costs (Details Textual)		3 Months Ended	12 Months Ended
	Oct. 29, 2018 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 ft²
Restructuring and Related Cost, Incurred Cost (Gain)			$ 1,806,000
Inventory Write-down			3,607,000	$ 2,605,000
Closure of Lighting Facility in New Windsor, New York [Member]
Expected Annual Savings from Closure of Facility	$ 4,000,000
Restructuring and Related Cost, Incurred Cost (Gain)			1,650,000
Inventory Write-down			1,119,000
Sell Manufacturing Facility In New Windsor, New York [Member] | Forecast [Member]
Proceeds from Sale of Manufacturing Facility, Gross		$ 12,000,000
Closure of Leased Facility in Hawthorne, California [Member]
Restructuring and Related Cost, Incurred Cost (Gain)			156,000
Inventory Write-down			$ 148,000
Area of Real Estate Property | ft²					12,000