Note 1 - Basis of Presentation (Details) - Reconciliation of Basic Weighted-average Shares Outstanding to Diluted Weighted-average Shares Outstanding - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of Basic Weighted-average Shares Outstanding to Diluted Weighted-average Shares Outstanding [Abstract]
Weighted-average shares outstanding-basic	71,637	57,862	64,968	57,855
Common stock equivalents - stock options and restricted stock	633	449	561	443
Weighted-average shares outstanding-diluted	72,270	58,311	65,529	58,298