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Note 16 - Share-based Compensation - Inputs Used for Valuation of Option Grants under Stock Option Plans (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Minimum [Member] |  |  |  |
Expected volatility |  |  | 40.20% | 44.50%
Weighted-average volatility |  |  | 40.20% | 44.50%
Expected dividends |  |  | 2.89% | 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%
Maximum [Member] |  |  |  |
Expected volatility |  |  | 43.10% | 44.90%
Weighted-average volatility |  |  | 43.10% | 44.90%
Expected dividends |  |  | 2.94% | 2.24%
Risk-free rate |  |  | 1.60% | 1.90%
Average risk-free rate |  |  | 1.60% | 1.90%
Expected term (in years) |  |  | 7 years 146 days | 7 years 73 days
Pre-vesting departure rate |  |  | 0.60% | 0.60%
Expected volatility | 40.20% | 44.50% |  |
Weighted-average volatility | 40.20% | 44.50% |  |
Expected dividends | 2.89% | 2.24% |  |
Risk-free rate | 1.60% | 1.90% |  |
Average risk-free rate | 1.60% | 1.90% |  |
Expected term (in years) | 7 years 146 days | 7 years 73 days |  |
Pre-vesting departure rate | 0.60% | 0.60% |  |

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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. + Details
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- Definition The pre-vesting departure rate used in the period for the valuation of option grants. + References No definition available. + Details
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- Definition 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 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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 + Details
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