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Note 15 - Stock-based Compensation - Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of options exercised (in shares)	144,150	699,400	558,150
Aggregate fair value	$ 2,859	$ 14,529	$ 10,718
Employee Stock Option [Member]
Number of options exercised (in shares)	144,150	699,400	558,150
Aggregate fair value	$ 5,222	$ 35,516	$ 27,973
Intrinsic value	2,364	21,463	17,223
Amount of cash received	2,858	14,053	10,750
Tax benefit recognized		$ 91	$ 5,856

X

- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

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-Publisher FASB
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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of share options (or share units) exercised during the current period.

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Value of stock issued as a result of the exercise of stock options.

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