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Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Number Outstanding - Options Outstanding (in Shares)	6,355,681	4,323,874	2,505,283	160,833
Weight-average Remaining Contractual Life - Options Outstanding	8 years 51 days
Weight-average Exercise Price - Options Outstanding	$ 8.22	$ 8.46	$ 6.13	$ 29.83
$3.80 to $3.80 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 3.80
Upper Range of Exercise Price	$ 3.80
Number Outstanding - Options Outstanding (in Shares)	5,000
Weight-average Remaining Contractual Life - Options Outstanding	7 years 361 days
Weight-average Exercise Price - Options Outstanding	$ 3.80
Number Exercisable - Options Exercisable (in Shares)	2,708
Weighted-average Exercise Price - Options Exercisable	$ 3.80
$5.20 to $5.20 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 5.20
Upper Range of Exercise Price	$ 5.20
Number Outstanding - Options Outstanding (in Shares)	1,072,887
Weight-average Remaining Contractual Life - Options Outstanding	4 years 7 days
Weight-average Exercise Price - Options Outstanding	$ 5.20
Number Exercisable - Options Exercisable (in Shares)	997,934
Weighted-average Exercise Price - Options Exercisable	$ 5.20
$6.40 to $7.00 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 6.40
Upper Range of Exercise Price	$ 7.00
Number Outstanding - Options Outstanding (in Shares)	386,613
Weight-average Remaining Contractual Life - Options Outstanding	8 years 219 days
Weight-average Exercise Price - Options Outstanding	$ 6.85
Number Exercisable - Options Exercisable (in Shares)	80,210
Weighted-average Exercise Price - Options Exercisable	$ 6.66
$7.20 to $7.20 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 7.20
Upper Range of Exercise Price	$ 7.20
Number Outstanding - Options Outstanding (in Shares)	3,190,240
Weight-average Remaining Contractual Life - Options Outstanding	9 years 124 days
Weight-average Exercise Price - Options Outstanding	$ 7.20
Number Exercisable - Options Exercisable (in Shares)	41,012
Weighted-average Exercise Price - Options Exercisable	$ 7.20
$7.40 to $10.60 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 7.40
Upper Range of Exercise Price	$ 10.60
Number Outstanding - Options Outstanding (in Shares)	852,372
Weight-average Remaining Contractual Life - Options Outstanding	9 years 138 days
Weight-average Exercise Price - Options Outstanding	$ 9.89
Number Exercisable - Options Exercisable (in Shares)	105,881
Weighted-average Exercise Price - Options Exercisable	$ 10.57
$11.00 to $15.00 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 11.00
Upper Range of Exercise Price	$ 15.00
Number Outstanding - Options Outstanding (in Shares)	730,285
Weight-average Remaining Contractual Life - Options Outstanding	7 years 197 days
Weight-average Exercise Price - Options Outstanding	$ 13.15
Number Exercisable - Options Exercisable (in Shares)	499,642
Weighted-average Exercise Price - Options Exercisable	$ 12.79
$15.40 to $130.40 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 15.40
Upper Range of Exercise Price	$ 130.40
Number Outstanding - Options Outstanding (in Shares)	117,598
Weight-average Remaining Contractual Life - Options Outstanding	6 years 160 days
Weight-average Exercise Price - Options Outstanding	$ 24.14
Number Exercisable - Options Exercisable (in Shares)	42,524
Weighted-average Exercise Price - Options Exercisable	$ 39.54
$139.20 to $139.20 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 139.20
Upper Range of Exercise Price	$ 139.20
Number Outstanding - Options Outstanding (in Shares)	125
Weight-average Remaining Contractual Life - Options Outstanding	1 year 29 days
Weight-average Exercise Price - Options Outstanding	$ 139.20
Number Exercisable - Options Exercisable (in Shares)	125
Weighted-average Exercise Price - Options Exercisable	$ 139.20
$196.00 to $196.00 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 196.00
Upper Range of Exercise Price	$ 196.00
Number Outstanding - Options Outstanding (in Shares)	436
Weight-average Remaining Contractual Life - Options Outstanding	14 days
Weight-average Exercise Price - Options Outstanding	$ 196.00
Number Exercisable - Options Exercisable (in Shares)	436
Weighted-average Exercise Price - Options Exercisable	$ 196.00
$235.12 to $235.12 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 235.12
Upper Range of Exercise Price	$ 235.12
Number Outstanding - Options Outstanding (in Shares)	125
Weight-average Remaining Contractual Life - Options Outstanding	146 days
Weight-average Exercise Price - Options Outstanding	$ 235.12
Number Exercisable - Options Exercisable (in Shares)	125
Weighted-average Exercise Price - Options Exercisable	$ 235.12
$3.80 to $235.12 [Member]
Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding [Line Items]
Lower Range of Exercise Price	$ 3.80
Upper Range of Exercise Price	$ 235.12
Number Outstanding - Options Outstanding (in Shares)	6,355,681
Weight-average Remaining Contractual Life - Options Outstanding	8 years 51 days
Weight-average Exercise Price - Options Outstanding	$ 8.22
Number Exercisable - Options Exercisable (in Shares)	1,770,597
Weighted-average Exercise Price - Options Exercisable	$ 8.67

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

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

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

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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.

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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.

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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.

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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.

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