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Note 8 - Summary of Status of Company's Stock Options (Details)
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Balance (in shares) 28,000
Balance (in dollars per share) | $ / shares $ 25.21
Options granted (in shares)
Options exercised (in shares)
Options cancelled (in shares) (2,000)
Options cancelled (in dollars per share) | $ / shares $ 28.31
Balance (in shares) 26,000
Balance (in dollars per share) | $ / shares $ 24.97
Balance 3 years 193 days
Exercisable, June 30, 2016 (in shares) 26,000
Exercisable, June 30, 2016 (in dollars per share) | $ / shares $ 24.97
Exercisable, June 30, 2016 3 years 193 days