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Borrowing Facilities	12 Months Ended
Borrowing Facilities	Dec. 31, 2019
Borrowing Facilities [Abstract]
Borrowing Facilities	9. Borrowing facilities: The Company had participated with the 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 renegotiated and renewed during the fourth quarter of 2019, and upon the renewal the Company no longer participates in the credit facility.