2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Net Investment Income [Line Items]
Bitcoin's Value	$ 43,035
Derivative investment asset	1,454	$ 2,697
Amount
Net Investment Income [Line Items]
Bitcoin's Value	126,951
Derivative investment asset	1,454	2,697
Investment in debt security	755	726
Total	129,160	3,423
Level 1
Net Investment Income [Line Items]
Bitcoin's Value	126,951
Derivative investment asset	0	0
Investment in debt security	0	0
Total	126,951	0
Level 2
Net Investment Income [Line Items]
Bitcoin's Value	0
Derivative investment asset	0	0
Investment in debt security	0	0
Total	0	0
Level 3
Net Investment Income [Line Items]
Bitcoin's Value	0
Derivative investment asset	1,454	2,697
Investment in debt security	755	726
Total	$ 2,209	$ 3,423