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Note 14 - Commitments and Contingencies (Details Textual)
$ in Thousands
 12 Months Ended
Jul. 01, 2018
USD ($)
ft²
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Area of Leased Facility (Square Foot) | ft² 54,766    
Operating Leases, Average Monthly Payments, Due in Third Year $ 77    
Operating Leases, Average Monthly Payments, Due in Fourth Year 79    
Operating Leases, Average Monthly Payments, Due in Fifth Year 81    
Operating Leases, Average Monthly Payments, Due in Sixth Year 84    
Operating Leases, Average Monthly Payments, Due in Seventh Year 86    
Operating Leases, Average Monthly Payments, Due in Eighth Year 89    
Operating Leases, Average Monthly Payments, Due in Ninth Year 92    
Operating Leases, Average Monthly Payments, Due in Tenth Year $ 94    
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 206 $ 220
Bonuses and Related Payroll Tax Expense [Member]      
Increase (Decrease) in Other Employee-Related Liabilities   $ 1,600 $ 1,300