Note 1 - General and Basis of Presentation - Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Contract assets (*)	[1]	$ 13,837	$ 24,544
Contract liabilities (*)	[1]	$ (13,452)	$ (11,179)

[1] Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts" and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the condensed consolidated balance sheets. The contract liabilities balance at the beginning of the year was not yet recognized as product revenues during the six months ended June 30, 2021 as a result of performance obligations having not been satisfied yet.