Note 1 - Summary of Significant Interim Accounting Policies - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets:
Contract assets		$ 47,098	$ 43,300
Inventory	[1]	36,380		64,979
Inventory	[1]	(36,380)		(64,979)
Prepaid and other current assets		10,005		11,011
Prepaid and other current assets		(10,005)		(11,011)
Deferred taxes		215		2,900
Deferred taxes		(215)		(2,900)
Liabilities:
Accounts payable		19,263		19,752
Other current liabilites		9,375		$ 12,409
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets:
Contract assets
Inventory		63,722
Inventory		(63,722)
Prepaid and other current assets		10,890
Prepaid and other current assets		(10,890)
Deferred taxes		2,872
Deferred taxes		(2,872)
Liabilities:
Accounts payable		16,492
Other current liabilites		8,112
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Assets:
Contract assets		47,098
Inventory		27,342
Inventory		(27,342)
Prepaid and other current assets		885
Prepaid and other current assets		(885)
Deferred taxes		2,657
Deferred taxes		(2,657)
Liabilities:
Accounts payable		2,771
Other current liabilites		$ 1,263

[1] Inventories consist of the following: March 31,2018 (Unaudited) December 31,2017 Finished goods $ 26,767 $ 54,354 Work in process 935 604 Raw materials 8,678 10,021 $ 36,380 $ 64,979