Note 7 - Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating losses	$ 59,551	$ 74,195
Fixed asset basis difference	4,559	10,662
Contributions carryover	4	5
Deferred compensation	1,352	2,375
Accrued liabilities	971	389
Total deferred tax assets	66,437	87,626
Valuation allowance for deferred tax assets	(66,437)	(87,626)
Net deferred tax asset