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Note 11 - Summary of Status of Company's Stock Options (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Balance (in shares) 38,000 40,000
Balance (in dollars per share) $ 26.05 $ 25.44
Options granted (in shares)
Options granted (in dollars per share)
Options exercised (in shares) (2,000) (2,000)
Options exercised (in dollars per share) $ 22.07 $ 14
Options cancelled (in shares) (8,000)
Options cancelled (in dollars per share) $ 29.98
Balance (in shares) 28,000 38,000
Balance (in dollars per share) $ 25.21 $ 26.05
Exercisable and Outstanding (in shares) 28,000  
Exercisable and Outstanding (in dollars per share) $ 25.21  
Exercisable and Outstanding 3 years 281 days  
Exercisable and Outstanding $ 0