Note 3 - Stock Awards Excluded from the Computation of the Effect of Dilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		25
Stock Appreciation Rights (SARs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1,027	1,066
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1,317	1,632
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		188
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	2,344	2,911