Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2017			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	$	-		$	-

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	201 7			201 6			2015
Expected federal income tax benefit at 34%	$	(11,477	)	$	(8,955	)	$	(8,163	)
Loss with no tax benefit provided		8,156			6,918			7,389
State income tax		4			4			4
Non-deductible expenses and other		3,321			2,037			774
Income tax expense	$	4		$	4		$	4