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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 |  |  |

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