Note 14 - Provision for Income Taxes (Details) - Components of Deferred Tax Assets and Liabilities - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Deferred tax assets | ||
| Compensation | $ 249 | $ 1,005 |
| Inventory reserves | 1,244 | 628 |
| Self insurance | 111 | 88 |
| Asset retirement obligation | 299 | 289 |
| Deferred revenue | 9,993 | 10,110 |
| Stock based compensation | 144 | 244 |
| Other | 81 | |
| Total deferred tax assets | 12,040 | 12,445 |
| Deferred tax liabilities | ||
| Available for sale securities | (1,075) | (2,618) |
| Derivative instruments | (1,348) | (488) |
| Accrued expenses | (656) | (592) |
| LIFO inventory | (5,163) | (6,062) |
| Depreciation | (39,930) | (41,520) |
| Other | (45) | (2,609) |
| Total deferred tax liabilities | (48,217) | (53,889) |
| Net deferred tax liabilities | (36,177) | (41,444) |
| Current deferred tax liability | (7,060) | (11,003) |
| Noncurrent deferred tax liability | $ (29,117) | $ (30,441) |