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Fair value of financial instruments
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Fair value of financial instruments

8.

Fair value of financial instruments:

The Company believes that the fair values of its financial instruments, including cash and cash equivalents, receivables and payables, approximate their respective book values because of their short-term nature.  The fair values described herein were determined using significant other observable inputs (Level 2) as defined by GAAP.