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Note 13 - Share-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Jun. 30, 2018
$ / 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 (87,083)
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share) | $ / shares $ 2.79
Number of Shares Exercised (in shares) | shares (579,653)
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares $ 1.77
Number of Shares Outstanding, Ending Balance (in shares) | shares 4,000,266
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share) | $ / shares $ 2.20
Number of Shares Exercisable (in shares) | shares 2,894,363
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) | $ / shares $ 2.30