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Note 17 - Stock-based Compensation - Stock Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock options outstanding (in shares)	216,859	298,740	759,683	503,834
Outstanding options, weighted-average exercise price (in dollars per share)	$ 8.80	$ 9.97	$ 11.36	$ 10.41
Outstanding options, weighted-average remaining contractual life (Year)	2 years 91 days
Stock options exercisable (in shares)	155,742
Exercisable options, weighted-average exercise price (in dollars per share)	$ 7.92
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)	$ 10.72
Stock options outstanding (in shares)	154,535
Outstanding options, weighted-average exercise price (in dollars per share)	$ 5.76
Outstanding options, weighted-average remaining contractual life (Year)	2 years 7 days
Stock options exercisable (in shares)	102,488
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)	10.73
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 15.45
Stock options outstanding (in shares)	47,886
Outstanding options, weighted-average exercise price (in dollars per share)	$ 10.83
Outstanding options, weighted-average remaining contractual life (Year)	1 year 178 days
Stock options exercisable (in shares)	47,886
Exercisable options, weighted-average exercise price (in dollars per share)	$ 10.83
Range 3 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	15.46
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 20.01
Stock options outstanding (in shares)	447
Outstanding options, weighted-average exercise price (in dollars per share)	$ 16.66
Outstanding options, weighted-average remaining contractual life (Year)	6 years 80 days
Stock options exercisable (in shares)	447
Exercisable options, weighted-average exercise price (in dollars per share)	$ 16.66
Range 4 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	20.02
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 49.91
Stock options outstanding (in shares)	13,991
Outstanding options, weighted-average exercise price (in dollars per share)	$ 35.12
Outstanding options, weighted-average remaining contractual life (Year)	7 years 83 days
Stock options exercisable (in shares)	4,921
Exercisable options, weighted-average exercise price (in dollars per share)	$ 23.83

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

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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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- 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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- 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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- 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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- 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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