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Note 15 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Minimum [Member]
Note 15 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans [Line Items]
Expected volatility	44.20%	45.70%	44.20%	45.70%
Weighted-average volatility	44.20%	45.70%	44.20%	45.70%
Expected dividends	2.67%	1.98%	1.92%	1.90%
Risk-free rate	2.00%	2.00%	1.90%	2.00%
Average risk-free rate	2.00%	2.00%	1.90%	2.00%
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 15 - Share-based Compensation (Details) - Inputs Used for Valuation of Option Grants under Stock Option Plans [Line Items]
Expected volatility	44.20%	45.70%	44.90%	46.20%
Weighted-average volatility	44.20%	45.70%	44.90%	46.20%
Expected dividends	2.67%	1.98%	2.67%	2.09%
Risk-free rate	2.00%	2.00%	2.00%	2.20%
Average risk-free rate	2.00%	2.00%	2.00%	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%

X

- References

No definition available.

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- Definition

The weighted average of risk free rates used in the period. Risk free rate is defined as the yield of a zero-coupon U.S. Treasury bond whose maturity period equals the option's expected term.

+ References

No definition available.

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- Definition

The pre-vesting departure rate used in the period for the valuation of option grants.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(iii)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(ii)



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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(iv)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(ii)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 14.D.2)



-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (f)(2)(i)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



-Number Topic 14



-Section D



-Subsection 2

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