Commitments and Contingencies: (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies:

Schedule of minimum rental commitments under noncancelable operating leases

2017	$	705,000
2018		718,800
2019		451,100
2020		—
2021		—
Thereafter		—
Total	$	1,874,900