Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	December 31,
	2020			2019
Deferred tax assets:
Net operating losses	$	75,303		$	70,202
Fixed asset basis difference		4,555			4,547
Contributions carryover		32			30
Deferred compensation		1,289			1,098
Accrued liabilities and others		303			271
Total deferred tax assets		81,482			76,148
Valuation allowance for deferred tax assets		(81,482	)		(76,148	)
Net deferred tax asset	$	-		$	-

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

	Year Ended December 31,
	2020			2019
Expected federal income tax benefit at 21%	$	(7,940	)	$	(6,200	)
Loss with no tax benefit provided		3,617			2,508
State income tax		7			6
Expiring carryforwards		1,547			2,427
Non-deductible expenses and other		2,776			1,265
Income tax expense	$	7		$	6