Note 16 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Inputs Used for Valuation of Option Grants under Stock Option Plans [Abstract]
Expected volatility	43.10%	44.90%
Weighted-average volatility	43.10%	44.90%
Expected dividends	2.94%	1.92%
Risk-free rate	1.50%	1.90%
Average risk-free rate	1.50%	1.90%
Expected term (in years)	7 years 146 days	7 years 73 days
Pre-vesting departure rate	0.60%	0.60%