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Note 12 - Basic and Diluted Earnings Per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Equity Option [Member]        
Potentially dilutive securities outstanding at period end excluded from the diluted computation as the inclusion would have been antidilutive:        
Options (in shares) 2,989,836 1,418,250 2,989,836 1,318,250
Warrant [Member]        
Potentially dilutive securities outstanding at period end excluded from the diluted computation as the inclusion would have been antidilutive:        
Options (in shares) 1,627,945 1,627,945
Income available to common stockholders $ (664,663) $ 290,511 $ (1,044,736) $ 796,145
Weighted average common shares outstanding (in shares) 31,828,167 33,253,719 32,146,928 33,244,929
Assumed exercise of dilutive options and warrants (in shares) 594,246 571,876
Weighted average dilutive shares outstanding (in shares) 31,828,167 33,847,965 32,146,928 33,816,805
Basic income per common share (in dollars per share) $ (0.02) $ 0.01 $ (0.03) $ 0.02
Diluted income per common share (in dollars per share) $ (0.02) $ 0.01 $ (0.03) $ 0.02
Options (in shares) 2,989,836 3,046,195 2,989,836 2,946,195