Note 14 - Employee 401(k) Plan

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

14.  EMPLOYEE 401(k) PLAN

The Company sponsors a 401(k) retirement savings plan for all employees in the United States who meet certain eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax purposes. The Company is not required to contribute and did not contribute to the plan in 2015, 2014 and 2013.