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Note 10 - Share-based Compensation - Stock Option Activity (Details)
 3 Months Ended
Dec. 31, 2017
$ / shares
shares
Number of Shares Outstanding, Beginning Balance (in shares) | shares 4,663,502
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share) | $ / shares $ 2.16
Number of Shares Granted (in shares) | shares 3,500
Weighted Average Exercise Price, Shares Granted (in dollars per share) | $ / shares $ 2.21
Number of Shares Forfeited/expired (in shares) | shares (80,833)
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) | $ / shares $ 2.84
Number of Shares Exercised (in shares) | shares (90,852)
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares $ 1.76
Number of Shares Outstanding, Ending Balance (in shares) | shares 4,495,317
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) | $ / shares $ 2.15
Number of Shares Exercisable (in shares) | shares 3,251,811
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) | $ / shares $ 2.24