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Note 13 - Share-based Payments - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options (Details)	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Number exercisable (in shares) | shares	213,769
Weighted average exercise price per share, options exercisable (in dollars per share)	$ 11.46
Weighted average remaining contractual life, options exercisable (Year)	2 years 255 days
Aggregate intrinsic value, options exercisable | $	$ 9,071,982
Number outstanding (in shares) | shares	363,608
Weighted average exercise price per share, options outstanding (in dollars per share)	$ 16.79
Weighted average remaining contractual life, options outstanding (Year)	3 years 219 days
Aggregate intrinsic value, options outstanding | $	$ 13,494,808
Exercise Price Range 01 [Member]
Number exercisable (in shares) | shares	123,395
Weighted average exercise price per share, options exercisable (in dollars per share)	$ 6.46
Weighted average remaining contractual life, options exercisable (Year)	1 year 328 days
Aggregate intrinsic value, options exercisable | $	$ 5,853,446
Exercise price - lower (in dollars per share)	$ 2.92
Exercise price - higher (in dollars per share)	$ 8.92
Number outstanding (in shares) | shares	123,395
Weighted average exercise price per share, options outstanding (in dollars per share)	$ 6.46
Weighted average remaining contractual life, options outstanding (Year)	1 year 328 days
Aggregate intrinsic value, options outstanding | $	$ 5,853,446
Exercise Price Range 02 [Member]
Number exercisable (in shares) | shares	64,124
Weighted average exercise price per share, options exercisable (in dollars per share)	$ 16.01
Weighted average remaining contractual life, options exercisable (Year)	3 years 255 days
Aggregate intrinsic value, options exercisable | $	$ 2,429,911
Exercise price - lower (in dollars per share)	$ 10.16
Exercise price - higher (in dollars per share)	$ 19.95
Number outstanding (in shares) | shares	126,338
Weighted average exercise price per share, options outstanding (in dollars per share)	$ 16.28
Weighted average remaining contractual life, options outstanding (Year)	4 years
Aggregate intrinsic value, options outstanding | $	$ 4,752,589
Exercise Price Range 03 [Member]
Number exercisable (in shares) | shares	26,250
Weighted average exercise price per share, options exercisable (in dollars per share)	$ 23.86
Weighted average remaining contractual life, options exercisable (Year)	3 years 292 days
Aggregate intrinsic value, options exercisable | $	$ 788,625
Exercise price - lower (in dollars per share)	$ 21.10
Exercise price - higher (in dollars per share)	$ 27.53
Number outstanding (in shares) | shares	81,000
Weighted average exercise price per share, options outstanding (in dollars per share)	$ 23.65
Weighted average remaining contractual life, options outstanding (Year)	4 years 255 days
Aggregate intrinsic value, options outstanding | $	$ 2,450,242
Exercise Price Range 04 [Member]
Number exercisable (in shares) | shares
Weighted average exercise price per share, options exercisable (in dollars per share)
Weighted average remaining contractual life, options exercisable (Year)
Aggregate intrinsic value, options exercisable | $
Exercise price - lower (in dollars per share)	$ 35.25
Exercise price - higher (in dollars per share)	$ 37.35
Number outstanding (in shares) | shares	14,375
Weighted average exercise price per share, options outstanding (in dollars per share)	$ 35.89
Weighted average remaining contractual life, options outstanding (Year)	5 years 328 days
Aggregate intrinsic value, options outstanding | $	$ 258,906
Exercise Price Range 05 [Member]
Number exercisable (in shares) | shares
Weighted average exercise price per share, options exercisable (in dollars per share)
Weighted average remaining contractual life, options exercisable (Year)
Aggregate intrinsic value, options exercisable | $
Exercise price - lower (in dollars per share)	$ 43.15
Exercise price - higher (in dollars per share)	$ 47
Number outstanding (in shares) | shares	18,500
Weighted average exercise price per share, options outstanding (in dollars per share)	$ 44.19
Weighted average remaining contractual life, options outstanding (Year)	6 years 219 days
Aggregate intrinsic value, options outstanding | $	$ 179,625

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

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-Publisher FASB
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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+ References

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