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Note 7 - Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |
Risk-free interest rate |  |  | 0.56 | % |  |  | 0.97 | %
Volatility factor |  |  | 63.53 | % |  |  | 61.62 | %
Dividends |  |  | 0.00 | % |  |  | 0.00 | %
Weighted average expected life (years) |  |  | 3.91 |  |  |  | 3.78 |
Forfeiture rate |  |  | 15.00 | % |  |  | 15.00 | %
|  | Year Ended |
|  | December 31, |
|  | 2011 |
Risk-free interest rate |  |  | 2.74 | %
Volatility factor |  |  | 63.78 | %
Dividends |  |  | 0.00 | %
Weighted average expected life (years) |  |  | 5.51 |
Forfeiture rate |  |  | 0.00 | %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
Year Ended December 31, 2012 |
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Shares under option at beginning of year |  |  | 2,356,228 |  |  | $ | 8.34 |  |  |  |  |  |  |
Options granted |  |  | 303,150 |  |  |  | 3.63 |  |  |  |  |  |  |
Options exercised |  |  | (28,000 | ) |  |  | 4.09 |  |  |  |  |  |  |
Options cancelled |  |  | (419,890 | ) |  |  | 9.88 |  |  |  |  |  |  |
Shares under option at end of year |  |  | 2,211,488 |  |  | $ | 7.47 |  |  |  | 4.85 |  |  | $ | 3 |
Vested and expected to vest as end of year |  |  | 1,969,185 |  |  | $ | 7.78 |  |  |  | 4.74 |  |  | $ | 2 |
Options exercisable at end of year |  |  | 1,013,098 |  |  | $ | 7.64 |  |  |  | 3.45 |  |  | $ | 0 |
Year Ended December 31, 2011 |
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |
Shares under option at beginning of year |  |  | 1,794,694 |  |  | $ | 9.71 |
Options granted |  |  | 1,113,900 |  |  |  | 7.96 |
Options exercised |  |  | (18,500 | ) |  |  | 3.94 |
Options cancelled |  |  | (533,866 | ) |  |  | 12.30 |
Shares under option at end of year |  |  | 2,356,228 |  |  | $ | 8.34 |
Options exercisable at end of year |  |  | 989,972 |  |  | $ | 9.62 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number of Outstanding at December 31, 2012 |  |  | Weighted- Average Remaining Contractual Life |  |  | Weighted- Average Exercise Price |  |  | Number Exercisable at December 31, 2012 |  |  | Weighted- Average Exercise Price |
$ 3.22-$ 3.91 |  |  | 310,750 |  |  |  | 5.17 |  |  | $ | 3.59 |  |  |  | 170,000 |  |  | $ | 3.91 |
$ 3.92-$ 4.41 |  |  | 262,750 |  |  |  | 5.50 |  |  | $ | 4.18 |  |  |  | 70,502 |  |  | $ | 4.41 |
$ 4.42-$ 4.42 |  |  | 310,000 |  |  |  | 5.94 |  |  | $ | 4.42 |  |  |  | 103,336 |  |  | $ | 4.42 |
$ 4.43-$ 6.37 |  |  | 93,600 |  |  |  | 4.75 |  |  | $ | 5.24 |  |  |  | 44,203 |  |  | $ | 5.17 |
$ 6.38-$ 6.42 |  |  | 300,000 |  |  |  | 5.00 |  |  | $ | 6.42 |  |  |  | 150,000 |  |  | $ | 6.42 |
$ 6.43-$ 9.70 |  |  | 184,166 |  |  |  | 4.30 |  |  | $ | 7.29 |  |  |  | 124,835 |  |  | $ | 7.54 |
$ 9.71-$12.00 |  |  | 419,722 |  |  |  | 3.63 |  |  | $ | 10.62 |  |  |  | 219,722 |  |  | $ | 11.19 |
$12.85-$12.96 |  |  | 69,000 |  |  |  | 0.38 |  |  | $ | 12.93 |  |  |  | 69,000 |  |  | $ | 12.93 |
$12.97-$13.48 |  |  | 61,500 |  |  |  | 2.15 |  |  | $ | 13.34 |  |  |  | 61,500 |  |  | $ | 13.34 |
$13.49-$15.00 |  |  | 200,000 |  |  |  | 7.04 |  |  | $ | 15.00 |  |  |  | - |  |  | $ | 0.00 |
$ 3.22-$15.00 |  |  | 2,211,488 |  |  |  | 4.85 |  |  | $ | 7.47 |  |  |  | 1,013,098 |  |  | $ | 7.64 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  |  |  |  | Weighted Average |
|  | Number of Shares |  |  | Grant Date Fair Value |
Unvested at December 31, 2010 |  |  | 9,048 |  |  | $ | 11.94 |
Granted |  |  | - |  |  |  | 0.00 |
Vested |  |  | (4,925 | ) |  |  | 12.01 |
Forfeited |  |  | (2,905 | ) |  |  | 12.07 |
Unvested at December 31, 2011 |  |  | 1,218 |  |  | $ | 11.33 |
Granted |  |  | - |  |  |  | 0.00 |
Vested |  |  | (1,218 | ) |  |  | 11.33 |
Forfeited |  |  | - |  |  |  | 0.00 |
Unvested at December 31, 2012 |  |  | - |  |  | $ | 0.00 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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