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Note 6 - Share-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Balance (in shares) | shares 26,000
Balance (in dollars per share) | $ / shares $ 24.97
Options granted (in shares) | shares
Options granted (in dollars per share) | $ / shares
Options exercised (in shares) | shares
Options exercised (in dollars per share) | $ / shares
Options canceled (in shares) | shares (2,000)
Options canceled (in dollars per share) | $ / shares $ 34.77
Balance (in shares) | shares 24,000
Balance (in dollars per share) | $ / shares $ 24.15
Balance (Year)
Balance | $
Exercisable, September 30, 2017 (in shares) | shares 24,000
Exercisable, September 30, 2017 (in dollars per share) | $ / shares $ 24.15
Exercisable, September 30, 2017 (Year) 2 years 182 days
Exercisable, September 30, 2017 | $