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Note 10 - Stock-Based Compensation - Stock Options Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Range 1 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	$ 5.76
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 9.21
Stock options outstanding (in shares)	157,495
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.76
Options outstanding, weighted-average remaining contractual life	2 years 284 days
Stock options exercisable (in shares)	105,448
Exercisable options, weighted-average exercise price (in dollars per share)	$ 5.76
Range 2 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	9.22
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 15.47
Stock options outstanding (in shares)	96,544
Options outstanding, weighted-average exercise price (in dollars per share)	$ 12.61
Options outstanding, weighted-average remaining contractual life	1 year 149 days
Stock options exercisable (in shares)	96,544
Exercisable options, weighted-average exercise price (in dollars per share)	$ 12.61
Range 3 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	15.48
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 22.66
Stock options outstanding (in shares)	11,657
Options outstanding, weighted-average exercise price (in dollars per share)	$ 19.05
Options outstanding, weighted-average remaining contractual life	4 years 248 days
Stock options exercisable (in shares)	10,337
Exercisable options, weighted-average exercise price (in dollars per share)	$ 18.93
Range 4 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	22.67
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 49.50
Stock options outstanding (in shares)	9,148
Options outstanding, weighted-average exercise price (in dollars per share)	$ 36.61
Options outstanding, weighted-average remaining contractual life	7 years 146 days
Stock options exercisable (in shares)	2,648
Exercisable options, weighted-average exercise price (in dollars per share)	$ 24.59
Stock options outstanding (in shares)	274,844	298,740	471,251	759,683
Options outstanding, weighted-average exercise price (in dollars per share)	$ 9.76	$ 9.97	$ 10.65	$ 11.36
Options outstanding, weighted-average remaining contractual life	2 years 193 days
Stock options exercisable (in shares)	214,977
Exercisable options, weighted-average exercise price (in dollars per share)	$ 9.70

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ 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=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ 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 (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The ceiling 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term for option awards outstanding, 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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