Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net income available to Class A common stockholders:        
Interest income $ 1,588,000 $ 1,522,000 $ 5,154,000 $ 3,878,000
Less: Income and franchise taxes (375,000) (380,000) (1,205,000) (915,000)
Expenses available to be paid with interest income from Trust (up to a maximum of $750,000 per year) (161,000) (619,000)
Net income available to Class A common stockholders 1,213,000 981,000 3,949,000 2,344,000
Net income available to Class F common stockholders:        
Net income 53,000 981,000 1,533,000 2,344,000
Less: amount attributable to Class A common stockholders (1,213,000) (981,000) (3,949,000) (2,344,000)
Net income (loss) available to class F common stockholders $ (1,160,000) $ (2,416,000)