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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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- 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 + Details
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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 + Details
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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 + Details
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- 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 + Details
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- Definition 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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 -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 + Details
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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 + Details
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