Note 7 - Income Taxes - Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net operating losses	$ 70,202	$ 65,852
Fixed asset basis difference	4,547	4,551
Contributions carryover	30	32
Deferred compensation	1,098	1,073
Accrued liabilities	271	492
Total deferred tax assets	76,148	72,000
Valuation allowance for deferred tax assets	(76,148)	(72,000)
Net deferred tax asset