Note 12 - Mergers and Acquisitions - Purchase Price Allocation Fair Value Measurement (Details) - USD ($) $ in Thousands			12 Months Ended
		Sep. 25, 2015	Mar. 31, 2016		Dec. 31, 2017	Mar. 24, 2015
Goodwill			$ 0		$ 147,515
Nabors Industries, Ltd. [Member]
Accounts receivable			274,052			$ 262,973
Accounts receivable	[1]		11,079
Inventory			28,119			35,491
Inventory	[1]		(7,372)
Other current assets			6,917			8,857
Other current assets	[1]		(1,940)
Property and equipment			965,244		$ 965,244	1,024,622
Property, plant and equipment	[1]		(59,378)
Goodwill			456,846			444,162
Goodwill	[1]		12,684
Other intangible assets			42,000			28,300
Other intangible assets	[1]		13,700
Other assets			8,258			11,171
Other assets	[1]		(2,913)
Total assets acquired			1,781,436			1,815,576
Total assets acquired	[1]		(34,140)
Accounts payable			(176,303)			(195,913)
Accounts payable	[1]		19,610
Other current liabilities			(31,316)			(23,813)
Other current liabilities	[1]		(7,503)
Deferred income taxes			(208,883)			(187,515)
Deferred income taxes	[1]		(21,368)
Total liabilities assumed			(416,502)			(407,241)
Total liabilities assumed	[1]		(9,261)
Net assets acquired			1,364,934			$ 1,408,335
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred		$ 43,400	$ (43,401)	[1]

[1] The measurement period adjustments reflect changes in the estimated fair values of certain assets and liabilities, including income taxes. The measurement period adjustments were recorded to reflect new information obtained about facts and circumstances existing as of the date the Merger was consummated and did not result from intervening events subsequent to that date.