Note 1 - Summary of Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Contract assets		$ 47,359	$ 49,236
Inventory	[1]	65,753	67,301
Accounts payable		24,802	24,685
Other current liabilites		15,703	14,767
Deferred tax liability		7,365	$ 8,475
Accounting Standards Update 2014-09 [Member]
Inventory				$ (24,900)
Other current liabilites				$ 1,100
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Contract assets
Inventory		93,512
Accounts payable		22,008
Other current liabilites		12,811
Deferred tax liability		5,441
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Contract assets		47,359
Inventory		(27,759)
Accounts payable		2,794
Other current liabilites		2,892
Deferred tax liability		$ 1,924

[1] Inventories consist of the following: March 31, 2019 December 31, (Unaudited) 2018 Finished goods $ 56,552 $ 58,196 Work in process 527 650 Raw materials 8,674 8,455 $ 65,753 $ 67,301