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Note 8 - Leases (Details Textual)
3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
Number of Operating Right of Use Asset Related to Leased Facility 2   2      
Accounts Receivable, after Allowance for Credit Loss, Current $ 20,925,000   $ 20,925,000   $ 12,661,000  
Lease Receivable [Member]            
Operating Lease, Lease Income 13,600,000 $ 3,100,000 25,100,000 $ 8,000,000.0    
Lessor, Operating Lease, Payment to be Received, Next Rolling 12 Months 21,100,000   21,100,000      
Equipment [Member] | Lease Receivable [Member]            
Accounts Receivable, after Allowance for Credit Loss, Current $ 9,700,000   $ 9,700,000      
Land [Member] | Calgary, Alberta, Canada [Member]            
Number of Operating Right of Use Asset Related to Leased Facility 2   2      
Lessor, Operating Lease, Term of Contract (Year)           5 years
Operating Lease, Lease Income $ 52,000 $ 51,000 $ 98,000 $ 81,000    
Maximum [Member] | Equipment [Member]            
Lessor, Operating Lease, Term of Contract (Year) 1 year   1 year