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Note 8 - Summary of Status of Company's Stock Options (Details) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Balance, January 1, 2015 (in shares) 38,000
Balance, January 1, 2015 (in dollars per share) $ 26.05
Options granted (in shares)  
Options exercised (in shares) (2,000)
Options exercised (in dollars per share) $ 22.07
Options cancelled (in shares) (4,000)
Options cancelled (in dollars per share) $ 28.42
Balance, June 30, 2015 (in shares) 32,000
Balance, June 30, 2015 (in dollars per share) $ 26
Balance, June 30, 2015 3 years 288 days
Exercisable, June 30, 2015 (in shares) 32,000
Exercisable, June 30, 2015 (in dollars per share) $ 26
Exercisable, June 30, 2015 3 years 288 days