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Note 14 - Stock-based Compensation - Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number of options exercised (in shares)	285,700	144,150
Aggregate fair value	$ 5,640	$ 2,859
Employee Stock Option [Member]
Number of options exercised (in shares)	285,700	144,150
Aggregate fair value	$ 14,213	$ 5,222
Intrinsic value	8,572	2,364
Amount of cash received	5,641	2,858
Tax benefit recognized	$ 102

X

- Definition

Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

+ 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.

+ References

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