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Note 7 - Shareholders' Equity (Details) - Stock Option Activity 2012 (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Jan. 03, 2011
Mar. 07, 2008
Dec. 19, 2005
Dec. 31, 2013
Dec. 31, 2012
Stock Option Activity 2012 [Abstract]          
Number of shares under option       2,211,488 2,356,228
Weighted average exercise price per share       $ 7.47 $ 8.34
Options exercisable at end of year       1,107,116 1,013,098
Options exercisable at end of year       $ 6.32 $ 7.64
Options granted 50,000 50,000 48,000 228,000 303,150
Options granted       $ 3.60 $ 3.63
Options exercised       (3,000) (28,000)
Options exercised       $ 3.91 $ 4.09
Options cancelled       (304,866) (419,890)
Options cancelled       $ 7.94 $ 9.88
Number of shares under option       2,131,622 2,211,488
Weighted average exercise price per share       $ 6.99 $ 7.47