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Note 5 - Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Amortization of Intangible Assets $ 107 $ 152 $ 215 $ 306
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 215   215  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 335   335  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 242   242  
Finite-Lived Intangible Assets, Amortization Expense, Year Four $ 21   $ 21