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Note 13 - Defined Contribution Retirement Plan | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Pension and Other Postretirement Benefits Disclosure [Text Block] | 13. Defined Contribution Retirement Plan The Company has established a 401(k) defined contribution plan (the 401(k) Plan) that covers all employees who qualify under the terms of the plan. Eligible employees may elect to contribute to the 401(k) Plan up to 90% of their compensation, limited by the IRS-imposed maximum. The Company provides a safe harbor match with a maximum amount of 4% of the participant’s compensation. The Company made matching contributions under the 401(k) Plan of $28.0 thousand and $10.0 thousand for the years ended December 31, 2016 and 2015, respectively.

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