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Note 3 - Income Taxes - Uncertain Tax Liability (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Beginning balance $ 2,991,000 $ 3,244,000
Added liability for the prior year 2,393,000
Added liability for the current year 851,000
Tax payment upon settlement
Reduced liability for the current year (268,000) (253,000)
Ending balance $ 2,723,000 $ 2,991,000 $ 3,244,000