Note 11 - Retirement Plans (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% | ||
| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% | ||
| Defined Contribution Plan, Cost Recognized | $ 563 | $ 531 | $ 483 |
| Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0 | $ 0 | $ 0 |