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Note 10 - Stock-based Compensation - Stock Options Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 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)	156,945
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.76
Options outstanding, weighted-average remaining contractual life	2 years 189 days
Stock options exercisable (in shares)	104,898
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)	95,532
Options outstanding, weighted-average exercise price (in dollars per share)	$ 12.63
Options outstanding, weighted-average remaining contractual life	1 year 62 days
Stock options exercisable (in shares)	95,532
Exercisable options, weighted-average exercise price (in dollars per share)	$ 12.63
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)	7,548
Options outstanding, weighted-average exercise price (in dollars per share)	$ 19.72
Options outstanding, weighted-average remaining contractual life	6 years 335 days
Stock options exercisable (in shares)	6,228
Exercisable options, weighted-average exercise price (in dollars per share)	$ 19.66
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)	10,409
Options outstanding, weighted-average exercise price (in dollars per share)	$ 38.80
Options outstanding, weighted-average remaining contractual life	7 years 255 days
Stock options exercisable (in shares)	2,409
Exercisable options, weighted-average exercise price (in dollars per share)	$ 24.61
Stock options outstanding (in shares)	270,434	298,740	380,074	759,683
Options outstanding, weighted-average exercise price (in dollars per share)	$ 9.85	$ 9.97	$ 9.92	$ 11.36
Options outstanding, weighted-average remaining contractual life	2 years 135 days
Stock options exercisable (in shares)	209,067
Exercisable options, weighted-average exercise price (in dollars per share)	$ 9.53

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

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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