Note 9 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Year Ended December 31,
	2020			2019
Statutory tax (benefit) expense		21.0	%		21.0	%
Increase (decrease) in taxes resulting from:
Nondeductible expenses		(4.1	)		0.4
Valuation allowance		(16.9	)		(21.4	)
		0.0	%		0.0	%

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

	As of December 31,
	2020			2019
	(In thousands)
Deferred tax asset:
Carrying values of ownership interests and other holdings	$	38,361		$	32,760
Tax loss and credit carryforwards		76,023			70,914
Disallowed interest carryforwards		7,292			7,292
Accrued expenses		497			213
Stock-based compensation		302			432
Other		482			604
		122,957			112,215
Valuation allowance		(122,957	)		(112,215	)
Net deferred tax asset	$	—		$	—

Summary of Operating Loss Carryforwards [Table Text Block]

	Total
	(In thousands)
2021	$	3,728
2022		48,848
2023		52,512
2024		50,140
2025 and thereafter		170,189
	$	325,417