Note 5 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted-average Exercise Price		Weighted-average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Balance, December 31, 2015		1,031,170		$	31.27		0.9	$	3,268
Exercised		(2,110	)		23.37
Forfeited		(608,670	)		36.46
Balance, March 31, 2016		420,390		$	23.80		1.8	$	2,026
Exercisable, March 31, 2016		420,390		$	23.80		1.8	$	2,026

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Units
Balance at December 31, 2015		542,375
Vested		(4,812	)
Balance at March 31, 2016		537,563

Schedule of Tax Benefit (Short-fall) from Share-based Payment Arrangements [Table Text Block]

	Three months ended March 31,
(Dollars in thousands)	2016			2015
Tax benefit/(short-fall) of tax deductions in excess of grant-date fair value	$	(3,298	)	$	(4,395	)
Benefit of tax deductions on grant-date fair value		3,302			4,442
Total benefit of tax deductions	$	4		$	47