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Note 7 - Shareholders' Equity (Detail) - Stock option activity (USD $)
 1 Months Ended 3 Months Ended
Jan. 31, 2011
Mar. 31, 2008
Dec. 31, 2005
Mar. 31, 2013
Number of Shares       2,211,488
Weighted Average Exercise Price Per Share (in Dollars per share)       $ 7.47
Weighted Average Remaining Contractual Term       4 years 266 days
Vested and expected to vest as of March 31, 2013       2,055,554
Vested and expected to vest as of March 31, 2013 (in Dollars per share)       $ 7.49
Vested and expected to vest as of March 31, 2013       4 years 229 days
Vested and expected to vest as of March 31, 2013 (in Dollars)       $ 390
Options exercisable at March 31, 2013       1,045,897
Options exercisable at March 31, 2013 (in Dollars per share)       $ 7.31
Options exercisable at March 31, 2013       3 years 105 days
Options exercisable at March 31, 2013 (in Dollars)       110
Options granted 50,000 50,000 48,000 114,000
Options granted (in Dollars per share)       $ 3.39
Options exercised       (3,000)
Options exercised (in Dollars per share)       $ 3.91
Options forfeited       (25,132)
Options forfeited (in Dollars per share)       $ 4.40
Options expired       (33,000)
Options expired (in Dollars per share)       $ 11.87
Number of Shares       2,264,356
Weighted Average Exercise Price Per Share (in Dollars per share)       $ 7.23
Weighted Average Remaining Contractual Term       4 years 266 days
Aggregate Intrinsic Value (in Dollars)       $ 475