Note 1 - Summary of Significant Interim Accounting Policies - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract assets		$ 49,605	$ 43,300
Inventory	[1]	65,057		64,979
Deferred taxes		(8,525)
Accounts payable		25,024		19,752
Other current liabilites		14,804		$ 12,409
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Contract assets
Inventory		93,770
Deferred taxes		(5,639)
Accounts payable		22,239
Other current liabilites		12,730
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Contract assets		49,605
Inventory		(28,713)
Deferred taxes		(2,886)
Accounts payable		2,785
Other current liabilites		$ 2,074

[1] Inventories consist of the following: September 30, 2018 December 31, (Unaudited) 2017 Finished goods $ 54,702 $ 54,354 Work in process 868 604 Raw materials 9,487 10,021 $ 65,057 $ 64,979