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Retirement plan
12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Retirement plan
Retirement plan:
Effective January 1, 2012, the Company maintains a profit-sharing plan covering all eligible employees in accordance with Section 401(k) of the Internal Revenue Code. The plan is funded by employee and employer contributions. Employer contributions to the plan are at the discretion of the Company. There were no employer contributions in 2015 and 2014.