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Note 2 - Revenue (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Contract with Customer, Liability, Current $ 22,970,000 $ 22,970,000 $ 23,895,000
Contract with Customer, Liability, Revenue Recognized 2,262,000 22,475,000  
Contract with Customer, Asset, Net, Current, Total 5,506,000 5,506,000 0
Accounts Receivable, before Allowance for Credit Loss 47,909,000 47,909,000 48,517,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 5,643,000 $ 5,643,000 $ 4,806,000