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Note 11 - Employee Benefit Plans	12 Months Ended
Note 11 - Employee Benefit Plans	Dec. 31, 2017
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	Note 11 – Employee Benefit Plans The Company maintains a 401 (k) retirement plan that covers employees in the United States. Under the plan, a full-time or regular part-time (over 20 hours/week) employee becomes a participant after completing three months of employment. Employees may elect to contribute up to 50 percent of regular gross pay, subject to federal law limits on the dollar amount that participants may contribute to the plan, each calendar year. The Company matches part of the employee contributions and may make a discretionary contribution to the plan. Total employer contributions were approximately $1.9 million, $1.6 million and $1.2 million for the years ended December 31, 2017, 2016 and 2015, respectively. The Company also sponsors a defined contribution retirement plan that covers the employees in the United Kingdom. Total employer cont ributions were approximately $0.3 million, $0.2 million and $0.2 million for the years ended December 31, 2017, 2016 and 2015, respectively.