Note 19 - Share-based Compensation - Inputs Used for Valuation of Option Grants under Stock Option Plans (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Expected volatility	37.10%	43.60%	45.40%
Weighted-average volatility	37.10%	43.60%	45.40%
Expected dividends	2.28%	1.92%	1.90%
Risk-free rate	1.40%	1.90%	2.00%
Average risk-free rate	1.40%	1.90%	2.00%
Expected term (in years) (Year)	7 years 146 days	7 years 73 days	7 years 73 days
Pre-vesting departure rate	0.60%	0.60%	0.50%
Maximum [Member]
Expected volatility	43.10%	44.90%	46.20%
Weighted-average volatility	43.10%	44.90%	46.20%
Expected dividends	2.94%	2.68%	2.09%
Risk-free rate	2.10%	2.10%	2.20%
Average risk-free rate	2.10%	2.10%	2.20%
Expected term (in years) (Year)	7 years 146 days	7 years 73 days	7 years 73 days
Pre-vesting departure rate	0.60%	0.60%	0.50%