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Borrowing Facilities	3 Months Ended
Borrowing Facilities	Mar. 31, 2020
Borrowing Facilities [Abstract]
Borrowing Facilities	7. Borrowing facilities: The Company was a party with ATEL Capital Group and certain subsidiaries, and affiliated funds in a $75 million revolving credit facility with a syndicate of financial institutions as lenders. The credit facility was renewed during the fourth quarter of 2019, upon which, the Company ceased to be a participant.