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Note 5 - Intangible Assets (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Amortization of Intangible Assets $ 359,000 $ 290,000 $ 688,000 $ 579,000