Note 5 - Inventories, Net (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Inventory Write-down	$ 0	$ (68)
Product Line Exit Costs [Member]
Inventory Write-down	$ 621
Raw Materials and Scrap Parts [Member]
Inventory Write-down		$ (68)