Note 16 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Minimum [Member]
Note 16 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans [Line Items]
Expected volatility	44.50%	45.80%	44.50%	45.80%
Weighted-average volatility	44.50%	45.80%	44.50%	45.80%
Expected dividends	2.24%	1.90%	1.92%	1.90%
Risk-free rate	1.90%	2.20%	1.90%	2.20%
Average risk-free rate	1.90%	2.20%	1.90%	2.20%
Expected term (in years)	7 years 73 days	7 years 73 days	7 years 73 days	7 years 73 days
Pre-vesting departure rate	0.60%	0.50%	0.60%	0.50%
Maximum [Member]
Note 16 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans [Line Items]
Expected volatility	44.50%	45.80%	44.90%	46.20%
Weighted-average volatility	44.50%	45.80%	44.90%	46.20%
Expected dividends	2.24%	1.90%	2.24%	2.09%
Risk-free rate	1.90%	2.20%	1.90%	2.20%
Average risk-free rate	1.90%	2.20%	1.90%	2.20%
Expected term (in years)	7 years 73 days	7 years 73 days	7 years 73 days	7 years 73 days
Pre-vesting departure rate	0.60%	0.50%	0.60%	0.50%