Note 13 - Earnings Per Share - Weighted Average Shares Outstanding, Basic and Diluted Earnings Per Share Calculations (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic weighted average shares outstanding (in shares)	37,718,303	37,595,454	37,693,009	37,634,670
Effect of dilutive securities (in shares)	202,713	211,965	201,899	197,558
Diluted weighted average shares outstanding (in shares)	37,921,016	37,807,419	37,894,908	37,832,228