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Note 11 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended
Dec. 03, 2015
Dec. 31, 2016
Dec. 31, 2015
Stock Repurchased and Retired During Period, Shares   0 1,031,208
Stock Repurchased During Period, Value     $ 1,643,120
Common Stock, Dividends, Per Share, Declared $ 0.01 $ 0 $ 0.01
Share Buyback Program [Member]      
Stock Repurchase Program, Authorized Amount   $ 4,000,000