Note 2 - Basic and Diluted Earnings Per Share Computation (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted average shares outstanding – basic (in shares)	115,677	117,000	117,449
Effect of common stock equivalents (in shares)	1,051	1,445	1,955
Weighted average shares outstanding – diluted (in shares)	116,728	118,445	119,404