Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Product [Member] | ||
| Product Sales | $ 72,993 | $ 72,867 |
| Service [Member] | ||
| Product Sales | $ 467 | $ 424 |