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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Future amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets      
2021 $ 623    
2022 608    
2023 572    
2024 527    
2025 517    
Thereafter 1,414    
Totals 4,261 $ 2,883 $ 3,334
Trademarks [Member]      
Finite-Lived Intangible Assets      
2021 109    
2022 109    
2023 109    
2024 109    
2025 109    
Thereafter 884    
Totals 1,429 1,072 1,150
Client Relationships [Member]      
Finite-Lived Intangible Assets      
2021 408    
2022 408    
2023 408    
2024 408    
2025 408    
Thereafter 530    
Totals 2,570 1,670 1,918
Noncompete Agreements [Member]      
Finite-Lived Intangible Assets      
2021 102    
2022 91    
2023 55    
2024 10    
2025 0    
Thereafter 0    
Totals 258 131 178
Patents [Member]      
Finite-Lived Intangible Assets      
2021 4    
2022 0    
2023 0    
2024 0    
2025 0    
Thereafter 0    
Totals $ 4 $ 10 $ 16