|
Note 11 - Stock-based Compensation (Details) - Fair Value Option Grant Weighted Average Assumptions Using Black-Scholes Option Pricing Model
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Fair Value Option Grant Weighted Average Assumptions Using Black-Scholes Option Pricing Model [Abstract] | |||
| Risk-free interest rate | 1.41% | 1.32% | |
| Expected life (in years) | 6 years 3 months | 6 years 80 days | |
| Dividend yield | |||
| Expected volatility | 50.00% | 50.00% | |