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Note 13 - Stock-Based Compensation (Details) - Changes In Shares Under Option Plans (USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes In Shares Under Option Plans [Abstract]        
Beginning Balance 722,155 722,155 919,371 1,099,306
Beginning Balance $ 10.18 $ 10.18 $ 10.23 $ 9.63
Issued 3,300 3,300 5,500 4,950
Issued   $ 20.03 $ 15.48 $ 11.78
Exercised   (198,588) (167,882) (150,237)
Exercised   $ 9.99 $ 10.01 $ 6.32
Forfeited   (2,420) (3,493) (17,952)
Forfeited   $ 7.40 $ 6.22 $ 6.57
Expired   (23,113) (31,341) (16,696)
Expired   $ 10.05 $ 13.92 $ 10.48
Ending Balance   501,334 722,155 919,371
Ending Balance   $ 10.34 $ 10.18 $ 10.23