Note 1 - Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Schedule of Estimated Useful Lives [Table Text Block]

	(In years)
Leasehold improvements		15-20
Machinery and equipment — manufacturing and drilling		10
Machinery and equipment — computers		3-5
Office equipment — furniture and fixtures		5-15
Office equipment — other		5-10
Automobiles		5-7

Schedule of Weighted Average Number of Shares [Table Text Block]

	Year Ended December 31,
	2014		2013		2012
	(In thousands)
Weighted average number of shares used in computation of basic earnings per share		45,508		45,440		45,431
Add:
Additional shares from the assumed exercise of employee stock options		350		35		-
Weighted average number of shares used in computation of diluted earnings per share		45,858		45,475		45,431