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Note 10 - Summary of Option and Warrant Activity and Outstanding Shares (Details)
 3 Months Ended
Dec. 31, 2015
$ / shares
shares
Employee Stock Option [Member]  
Outstanding, Stock Options (in shares) | shares 875,977
Outstanding, Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 105,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 1.19
Forfeited or expired, Stock Options (in shares) | shares (149,780)
Forfeited or expired, Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.91
Outstanding, Stock Options (in shares) | shares 831,197
Outstanding, Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.32
Stock Warrants [Member]  
Outstanding, Stock Warrants (in shares) | shares 703,281
Outstanding, Stock Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 4.38
Forfeited or expired, Stock Warrants (in shares) | shares (10,000)
Forfeited or expired, Stock Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 7.50
Outstanding, Stock Warrants (in shares) | shares 693,281
Outstanding, Stock Warrants, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 4.33