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Note 14 - Benefit Plan
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Pension and Other Postretirement Benefits Disclosure [Text Block]
14.
BENEFIT PLAN
 
The Company sponsors a benefit plan for the benefit of all eligible employees. The plan qualifies under Section
401(k)
of the Internal Revenue Code thereby allowing eligible employees to make tax-deductible contributions to the plan. The plan provides for employer matching contributions of
50%
of each participant’s voluntary contribution up to
3%
of the participant’s compensation and vests at the rate of
20%
each year until fully vested after
five
years. Total employer matching contributions to the plan were approximately
$161,000,
$171,000
and
$162,000
in
2016,
2015
and
2014,
respectively.