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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Future amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets      
2022 $ 3,455    
2023 3,417    
2024 3,370    
2025 3,360    
2026 3,158    
Thereafter 7,473    
Totals 24,233 $ 4,261 $ 2,883
Trademarks      
Finite-Lived Intangible Assets      
2022 109    
2023 109    
2024 109    
2025 108    
2026 108    
Thereafter 777    
Totals 1,320 1,429 1,072
Client Relationships      
Finite-Lived Intangible Assets      
2022 2,913    
2023 2,913    
2024 2,912    
2025 2,912    
2026 2,851    
Thereafter 6,696    
Totals 21,197 2,570 1,670
Non-Compete Agreements      
Finite-Lived Intangible Assets      
2022 431    
2023 395    
2024 349    
2025 340    
2026 199    
Thereafter 0    
Totals 1,714 258 131
Patents      
Finite-Lived Intangible Assets      
2022 2    
2023 0    
2024 0    
2025 0    
2026 0    
Thereafter 0    
Totals $ 2 $ 4 $ 10