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BORROWINGS - Summary of Borrowings by Type (Details) - USD ($) |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 28, 2021 | Aug. 17, 2021 | Mar. 11, 2021 | Mar. 03, 2021 | Feb. 04, 2021 | Jan. 28, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 10, 2020 | Feb. 20, 2020 | Dec. 31, 2019 | Dec. 05, 2014
MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |
Principal Outstanding |  |  |  |  |  |  | $ 37,000,000 |  |  |  |  |
Farmer Mac Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  |  |  | $ 2,460,000 |  |  |  | $ 225,000,000 |  |  | $ 125,000,000
Stated Interest Rate |  |  |  |  | 3.13% |  |  |  |  |  |  |
Principal amortization term |  |  |  |  | 25 years |  |  |  |  |  |  |
Farm Credit West, FLCA |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  |  |  |  | $ 2,073,000 |  |  |  |  |  |
Stated Interest Rate |  |  |  |  |  | 3.23% |  | 4.99% |  |  |  |
Principal amortization term |  |  |  |  |  | 24 years 9 months 18 days |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |
Mid Atlantic Farm Credit, ACA |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  |  | $ 960,000 |  |  |  |  |  |  |  |
Stated Interest Rate |  |  |  | 3.80% |  |  |  |  |  |  |  |
Principal amortization term |  |  |  | 24 years 4 months 24 days |  |  |  |  |  |  |  |
GreenStone Farm Credit Services, FLCA |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  | $ 7,980,000 |  |  |  |  |  |  |  |  |  |
Stated Interest Rate |  | 4.00% |  |  |  |  |  |  |  |  |  |
Principal amortization term |  | 25 years 6 months |  |  |  |  |  |  |  |  |  |
Golden State Farm Credit, FLCA, Due 2051 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount | $ 15,960,000 |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rate | 3.75% |  |  |  |  |  |  |  |  |  |  |
Principal amortization term | 30 years |  |  |  |  |  |  |  |  |  |  |
Golden State Farm Credit, FLCA, Due 2046 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount | $ 6,840,000 |  |  |  |  |  |  |  |  |  |  |
Stated Interest Rate | 3.75% |  |  |  |  |  |  |  |  |  |  |
Principal amortization term | 25 years |  |  |  |  |  |  |  |  |  |  |
Rabo AgriFinance, LLC, 2.11% Through December 1, 2030 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  | $ 3,780,000 |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  | 3.27% |  |  |  |  |  |  |  |  |
Principal amortization term |  |  | 25 years |  |  |  |  |  |  |  |  |
Rabo AgriFinance, LLC, 2.11% Through December 1, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  | $ 630,000 |  |  |  |  |  |  |  |  |
Stated Interest Rate |  |  | 2.44% |  |  |  |  |  |  |  |  |
Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  |  |  |  |  | 75,000,000 |  |  | $ 75,000,000 |  |
Principal Outstanding |  |  |  |  |  |  | $ 36,900,000 |  |  |  |  |
Stated Interest Rate |  |  |  |  |  |  | 2.75% |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  | $ 38,100,000 |  |  |  | $ 21,500,000 |
Additional amount, maximum |  |  |  |  |  |  | 24,200,000 |  |  |  |  |
Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment, Amount |  |  |  |  |  |  | 75,000,000 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  | 100,000 |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  | 74,900,000 |  |  |  |  |
Additional amount, maximum |  |  |  |  |  |  | $ 24,200,000 |  |  |  |  |
Minimum annualized rate |  |  |  |  |  |  | 2.50% |  |  |  |  |
Line of credit | MetLife Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate |  |  |  |  |  |  | 2.00% |  |  |  |  |
Minimum | Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Undrawn amounts |  |  |  |  |  |  | 0.10% |  |  |  |  |
Minimum | Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Undrawn amounts |  |  |  |  |  |  | 0.10% |  |  |  |  |
Maximum | Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Undrawn amounts |  |  |  |  |  |  | 0.20% |  |  |  |  |
Maximum | Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Undrawn amounts |  |  |  |  |  |  | 0.20% |  |  |  |  |

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