Note 16 - 401(k) Plan	12 Months Ended
Dec. 31, 2017
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	16. 401 (k) Plan The Company sponsors a 401 (k) plan that stipulates that eligible employees can elect to contribute to the 401 (k) plan, subject to certain limitations. Pursuant to the 401 (k) plan, the Company makes a matching contribution of up to 4% of the related compensation. Under the vesting schedule, employees have ownership in the matching Employer Contributions based on the number of years of vesting service completed. Company contributions were $0.3 million, $0.3 million and $0.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Note 16 - 401(k) Plan

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

Pension and Other Postretirement Benefits Disclosure [Text Block]

16.

401

(k) Plan

The Company sponsors a

401

(k) plan that stipulates that eligible employees can elect to contribute to the

401

(k) plan, subject to certain limitations. Pursuant to the

401

(k) plan, the Company makes a matching contribution of up to

of the related compensation. Under the vesting schedule, employees have ownership in the matching Employer Contributions based on the number of years of vesting service completed. Company

contributions were

$0.3

million,

$0.3

million and

$0.3

million for the years ended

December 31, 2017,

2016

and

2015,

respectively.