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Profit Sharing Plan and Incentive Savings Plan	12 Months Ended
Profit Sharing Plan and Incentive Savings Plan	Dec. 31, 2017
Profit Sharing Plan and Incentive Savings Plan [Abstract]
Profit Sharing Plan and Incentive Savings Plan	N. Profit Sharing Plan and Incentive Savings Plan The Company has a qualified contributory employee profit sharing plan and incentive savings plan covering substantially all employees. Company contributions to the plans are determined annually by the Board of Directors but may not exceed the amount permitted as a deductible expense under the Internal Revenue Code. The Company accrued contributions of approximately $109,000, $77,000 and $26,000 to the plans for the years ended December 31, 2017, 2016 and 2015, respectively.