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Note 7 - Shareholders' Equity (Detail) - Stock option activity (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Jan. 31, 2011
Mar. 31, 2008
Dec. 31, 2005
Dec. 31, 2012
Dec. 31, 2011
Shares under option 1,794,694     2,356,228 1,794,694
Shares under option (in Dollars per share) $ 9.71     $ 8.34 $ 9.71
Shares under option       4 years 310 days  
Vested and expected to vest as end of year       1,969,185  
Vested and expected to vest as end of year (in Dollars per share)       $ 7.78  
Vested and expected to vest as end of year       4 years 270 days  
Vested and expected to vest as end of year (in Dollars)       $ 2  
Options exercisable at end of year       1,013,098 989,972
Options exercisable at end of year (in Dollars per share)       $ 7.64 $ 9.62
Options exercisable at end of year       3 years 164 days  
Options exercisable at end of year (in Dollars)       0  
Options granted 50,000 50,000 48,000 303,150 1,113,900
Options granted (in Dollars per share)       $ 3.63 $ 7.96
Options exercised       (28,000) (18,500)
Options exercised (in Dollars per share)       $ 4.09 $ 3.94
Options cancelled       (419,890) (533,866)
Options cancelled (in Dollars per share)       $ 9.88 $ 12.30
Shares under option       2,211,488 2,356,228
Shares under option (in Dollars per share)       $ 7.47 $ 8.34
Shares under option       4 years 310 days  
Shares under option (in Dollars)       $ 3