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Fair Value of Financial Assets and Liabilities: (Details)	12 Months Ended
	Dec. 31, 2020
Fair Value of Financial Assets and Liabilities: (Details) [Line Items]
financial instruments to domestic issuers	100.00%
Level 3 [Member]
Fair Value of Financial Assets and Liabilities: (Details) [Line Items]
Instruments, percentage	100.00%

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