Note 1 - Summary of Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets:
Contract asset	$ 49,236
Inventory	67,301		64,979
Liabilities:
Accounts payable	24,685		19,752
Other current liabilities	14,767		12,409
Deferred taxes	8,475
Accounting Standards Update 2014-09 [Member]
Assets:
Inventory		$ (24,900)
Liabilities:
Other current liabilities		$ 1,100
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Assets:
Contract asset
Inventory	95,984
Liabilities:
Accounts payable	21,981
Other current liabilities	12,798
Deferred taxes	5,589
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Assets:
Contract asset	49,236
Inventory	(28,683)
Liabilities:
Accounts payable	2,704
Other current liabilities	1,969
Deferred taxes	$ 2,886