Note 14 - Stock-based Compensation (Details) - Fair Value of Each Option Using Black-Scholes Valuation Model Assumptions	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 05, 2014	Feb. 11, 2014
Note 14 - Stock-based Compensation (Details) - Fair Value of Each Option Using Black-Scholes Valuation Model Assumptions [Line Items]
Risk-free interest rates	1.70%	0.80%	1.00%
Expected life (in years)	5 years 36 days	4 years 219 days	5 years
Dividend yield	0.90%	0.71%	0.81%
Expected volatility	35.10%	37.80%	47.20%
Chief Financial Officer [Member] | 2012 Incentive Plan [Member]
Note 14 - Stock-based Compensation (Details) - Fair Value of Each Option Using Black-Scholes Valuation Model Assumptions [Line Items]
Risk-free interest rates				1.30%	0.81%
Expected life (in years)				4 years	3 years 136 days
Dividend yield				0.70%	0.80%
Expected volatility				32.40%	33.50%
Forfeiture rate				0.00%	0.00%