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Significant Accounting Policies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Provision for federal income taxes		$ 0
Minimum days required to stay for tax liability		183 days
Dividend payable, amount per share	$ 0.04646	$ 0.04646
Dividend payable, date to be paid	Apr. 08, 2019
Dividends Payable, date of record	Apr. 02, 2019
Distributions Paid	$ 81,305	$ 257,009	$ 60,690

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Minimum period require to stay for tax liability.

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Name Accounting Standards Codification
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-Section 45
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