Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	December 31,
	2019			2018
Deferred tax assets:
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	$	-		$	-

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

	Year Ended December 31,
	2019			2018			2017
Expected federal income tax benefit: (2019 & 2018 at 21%; 2017 at 34%)	$	(6,200	)	$	(5,516	)	$	(11,477	)
Loss with no tax benefit provided		2,508			4,175			8,156
State income tax		6			6			4
Expiring carryforwards		2,427			-			-
Non-deductible expenses and other		1,265			1,341			3,321
Income tax expense	$	6		$	6		$	4