Note 15 - Stock-Based Compensation (Details) - Options Outstanding (USD $)	12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in Shares)	661,771
Number exercisable (in Shares)	420,429
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range	$ 7.72
Exercise price range, upper range	$ 8.93
Number outstanding (in Shares)	51,990
Weighted average remaining contractual life	5 years 324 days
Weighted average exercise price options outstanding	$ 8.13
Number exercisable (in Shares)	29,140
Weighted average exercise price options exercisable	$ 8.19
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range	$ 9.00
Exercise price range, upper range	$ 10.24
Number outstanding (in Shares)	198,499
Weighted average remaining contractual life	5 years 299 days
Weighted average exercise price options outstanding	$ 9.22
Number exercisable (in Shares)	131,420
Weighted average exercise price options exercisable	$ 9.21
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range	$ 13.25
Exercise price range, upper range	$ 16.85
Number outstanding (in Shares)	237,893
Weighted average remaining contractual life	4 years 335 days
Weighted average exercise price options outstanding	$ 15.85
Number exercisable (in Shares)	169,514
Weighted average exercise price options exercisable	$ 15.94
Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range	$ 17.00
Exercise price range, upper range	$ 18.60
Number outstanding (in Shares)	114,424
Weighted average remaining contractual life	7 years 18 days
Weighted average exercise price options outstanding	$ 17.33
Number exercisable (in Shares)	31,390
Weighted average exercise price options exercisable	$ 17.86
Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range	$ 19.05
Exercise price range, upper range	$ 20.63
Number outstanding (in Shares)	30,265
Weighted average remaining contractual life	1 year 14 days
Weighted average exercise price options outstanding	$ 19.10
Number exercisable (in Shares)	30,265
Weighted average exercise price options exercisable	$ 19.10
Range 6 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range	$ 21.00
Exercise price range, upper range	$ 22.00
Number outstanding (in Shares)	28,700
Weighted average remaining contractual life	58 days
Weighted average exercise price options outstanding	$ 21.28
Number exercisable (in Shares)	28,700
Weighted average exercise price options exercisable	$ 21.28

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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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

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Weighted average remaining contractual term of outstanding stock options, 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

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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

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