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Note 5 - Net Income per Share (Details)
3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2013
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 123,000 1,300,000 115,000 1,700,000