Annual report pursuant to Section 13 and 15(d)

Note 10 - Share-based Compensation - Summary of Restricted Share Activity, Excluding Company's Employee Stock Purchase Plan (Details)

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Note 10 - Share-based Compensation - Summary of Restricted Share Activity, Excluding Company's Employee Stock Purchase Plan (Details) - Restricted Stock [Member] - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Unvested, number of shares (in shares) 57,333 170,832
Unvested, weighted average grant date fair value (in dollars per share) $ 2.21 $ 2.09
Granted, number of shares (in shares) 0 0
Granted, weighted average grant date fair value (in dollars per share)
Vested, number of shares (in shares) (15,730) (64,182)
Vested, weighted average grant date fair value (in dollars per share) $ 0.88 $ 1.74
Vested $ 83,003 $ 236,161
Vested shares forgone to satisfy minimum statutory withholding, number of shares (in shares) (20,811) (16,484)
Vested shares forgone to satisfy minimum statutory withholding, weighted average grant date fair value (in dollars per share) $ 2.80 $ 2.81
Vested shares forgone to satisfy minimum statutory withholding $ 51,304 $ 49,592
Forfeitures, number of shares (in shares) (8,333) (32,833)
Forfeitures, weighted average grant date fair value (in dollars per share) $ 2.60 $ 2.18
Unvested, number of shares (in shares) 12,459 57,333
Unvested, weighted average grant date fair value (in dollars per share) $ 2.61 $ 2.21