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Note 9 - Stock option plans: (Detail) - Details of stock option transactions for the three months ended June 30, 2011 and June 30, 2010 are (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Outstanding, beginning of year 8,746,041 8,272,249 7,213,977
Outstanding, beginning of year (in Dollars per share) $ 0.57 $ 0.56 $ 0.56
Granted 779,000 706,000 1,804,000
Granted (in Dollars per share) $ 1.36 $ 0.74 $ 0.69
Exercised (766,340) (73,708) (33,678)
Exercised (in Dollars per share) $ 0.55 $ 0.43 $ 0.44
Forfeited (163,001) (98,500) (204,959)
Forfeited (in Dollars per share) $ 0.80 $ 0.69 $ 0.66
Expired (3,014) (60,000) (507,091)
Expired (in Dollars per share) $ 0.44 $ 0.80 $ 1.02
Outstanding, end of year 8,592,686 8,746,041 8,272,249
Outstanding, end of year (in Dollars per share) $ 0.64 $ 0.57 $ 0.56
Options exercisable, end of year 7,090,892 7,042,415 6,205,248
Options exercisable, end of year (in Dollars per share) $ 0.57 $ 0.54 $ 0.51