| 8 . | INCOME TAXES |
| 2017 | 2016 | |||||||
| (in thousands) | ||||||||
| Federal income tax expense at statutory rate | $ | 3,815 | $ | 7,635 | ||||
| Adjusted for: | ||||||||
| Valuation allowance | (3,814 | ) | (7,603 | ) | ||||
| Permanent differences and other | (1 | ) | (32 | ) | ||||
| Income tax benefit - continuing operations | $ | - | $ | - | ||||
| 2017 | 2016 | |||||||
| (in thousands) | ||||||||
| Net operating loss and tax credit carryforwards | $ | 25,745 | $ | 38,915 | ||||
| Joint venture and other investments | (22 | ) | 18 | |||||
| Accrued retirement benefits | 2,483 | 3,924 | ||||||
| Property net book value | 1,716 | 2,801 | ||||||
| Deferred revenue | 546 | 953 | ||||||
| Stock compensation | 13 | 22 | ||||||
| Reserves and other | (115 | ) | 404 | |||||
| Total deferred tax assets | 30,366 | 47,037 | ||||||
| Valuation allowance | (30,366 | ) | (47,037 | ) | ||||
| Net deferred tax assets | $ | - | $ | - | ||||