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Note 9 - Stock-Based Compensation (Details) - Changes in Shares Under Option Plans (USD $)
1 Months Ended 9 Months Ended
Feb. 28, 2014
Sep. 30, 2014
Sep. 30, 2013
Changes in Shares Under Option Plans [Abstract]      
Beginning Balance   501,334 722,155
Beginning Balance   $ 10.34 $ 10.18
Issued 21,000 21,000 3,300
Issued   $ 32.77 $ 20.03
Exercised   (64,926) (117,791)
Exercised   $ 16.78 $ 10.58
Forfeited   (110) (2,090)
Forfeited   $ 5.76 $ 7.65
Expired   (1,225) (23,113)
Expired   $ 9.00 $ 10.05
Ending Balance   456,073 582,461
Ending Balance   $ 10.46 $ 10.17