Note 4 - Inventory (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Inventory Disclosure [Abstract] | ||
| Effect of LIFO Inventory Liquidation on Income | $ 0 | $ 945 |
| Inventory, LIFO Reserve, Effect on Income, Net | $ 1,595 | $ 0 |