Note 16 - Earnings Per Share - Weighted Average Shares Outstanding, Basic and Diluted Earnings Per Share Calculations (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic weighted average shares outstanding (in shares)	37,615,991	37,595,454	37,568,274	37,740,714	37,962,801	33,358,376	33,375,753	33,371,946	37,629,975	34,526,622	28,410,579
Effect of dilutive securities (in shares)	217,133	211,965	204,685	174,789	210,433	138,922	145,737	179,830	202,761	169,140	472,532
Diluted weighted average shares outstanding (in shares)	37,833,124	37,807,419	37,772,959	37,915,503	38,173,234	33,497,298	33,521,490	33,551,776	37,832,736	34,695,762	28,883,111