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Note 11 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Payroll and related $ 2,054 $ 2,545
Contract liability, current 3,789  
Accrued contract costs 1,007 719
Warranty reserve 144 126
Other 76
Total 6,994 7,880
Deferred Revenue [Member]    
Contract liability, current 620 731
Customer Deposits [Member]    
Contract liability, current $ 3,169 $ 3,683