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Note 16 - Stockholders' Equity - Vesting Schedule (Details)	12 Months Ended
	Dec. 31, 2017
Vesting period	3 years
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche One [Member] | Awards Using Vesting Schedule A [Member]
Vesting period	1 year
Vesting percentage	25.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche One [Member] | Awards Using Vesting Schedule B [Member]
Vesting period	2 years
Vesting percentage	33.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche One [Member] | Awards Using Vesting Schedule C [Member]
Vesting period	4 years
Vesting percentage	50.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche One [Member] | Awards Using Vesting Schedule D [Member]
Vesting period	180 days
Vesting percentage	20.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Two [Member] | Awards Using Vesting Schedule A [Member]
Vesting period	2 years
Vesting percentage	50.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Two [Member] | Awards Using Vesting Schedule B [Member]
Vesting period	3 years
Vesting percentage	67.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Two [Member] | Awards Using Vesting Schedule C [Member]
Vesting period	4 years 270 days
Vesting percentage	100.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Two [Member] | Awards Using Vesting Schedule D [Member]
Vesting period	1 year 180 days
Vesting percentage	40.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Three [Member] | Awards Using Vesting Schedule A [Member]
Vesting period	3 years
Vesting percentage	75.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Three [Member] | Awards Using Vesting Schedule B [Member]
Vesting period	4 years
Vesting percentage	100.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Three [Member] | Awards Using Vesting Schedule D [Member]
Vesting period	2 years 180 days
Vesting percentage	60.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Four [Member] | Awards Using Vesting Schedule A [Member]
Vesting period	4 years
Vesting percentage	100.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Four [Member] | Awards Using Vesting Schedule D [Member]
Vesting period	3 years 180 days
Vesting percentage	80.00%
Stock Incentive Plan 2009 [Member] | Share-based Compensation Award, Tranche Five [Member] | Awards Using Vesting Schedule D [Member]
Vesting period	4 years 180 days
Vesting percentage	100.00%

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

Percentage of vesting of share-based compensation awards.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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