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Note 8 - Stockholders' Equity - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Compensation expense, total $ 249 $ 43 $ 364 $ 133
Cost of Sales [Member]        
Compensation expense 6 6 19 18
Operating Expense [Member]        
Compensation expense 86 37 188 115
Interest and Other Expense [Member]        
Compensation expense $ 157 $ 0 $ 157 $ 0