Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	For the Year Ended December 31,
	2019			2018
US operations	$	(3,030,960	)	$	(3,345,925	)
Foreign operations		(131,704	)		(361,522	)
	$	(3,162,664	)	$	(3,707,447	)

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

	As of December 31,
	2019			2018
Deferred tax assets:
Operating loss carryforwards	$	36,577,000		$	35,706,000
Accrued expenses		5,940,000			5,953,000
Tax credit carryforwards		4,017,000			3,951,000
Intellectual property		4,049,000			3,996,000
Equipment		71,000			110,000
Total deferred tax assets		50,654,000			49,716,000
Deferred tax liabilities:		—			—
Net deferred tax asset		50,654,000			49,716,000
Valuation allowance		(50,654,000	)		(49,716,000	)
	$	—		$	—

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

	For the Year Ended December 31,
	2019			2018
Tax at the U.S. statutory rate	$	(664,000	)	$	(779,000	)
Change in value of warrant liability		(15,000	)		(202,000	)
Valuation allowance		679,000			981,000
Other		—			—
	$	—		$	—

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Unrecognized Tax Benefits		Interest and Penalties
Balance at January 1, 2018	$	493,000	$	—
Deferred tax position		11,000		—
Balance at December 31, 2018		504,000		—
Deferred tax position		6,000		—
Balance at December 31, 2019	$	510,000	$	—