Note 10 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Summary of Operating Loss Carryforwards [Table Text Block]

Year Ending December 31,	Amount
2020	$	174,000
2021		71,000
2024		66,000
2028		7,000
2030		160,000
2031		73,000
2032		48,000
2034		727,000
2035		1,969,000
2036		2,867,000
2037		2,481,000
Indefinite		9,692,000
Total	$	18,335,000

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

	2019			2018
Deferred tax assets:
Net operating loss carryforwards	$	4,496,000		$	3,017,000
Tax credits		4,292,000			3,085,000
Impairment allowances		13,000			10,000
Stock-based compensation		20,000			64,000
Other		62,000			62,000
Less valuation allowance		(8,881,000	)		(6,235,000	)
Deferred tax asset, net of valuation		2,000			3,000
Deferred tax liabilities:
Property and equipment		(2,000	)		(3,000	)
Deferred tax liabilities		(2,000	)		(3,000	)
Net tax assets	$	-		$	-

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

	2019			2018
Tax benefit (expense) at Federal statutory rate	$	1,582,000		$	894,000
Effect of State taxes		265,000			185,000
Effect of tax rate change		(102,000	)		-
Tax credits		1,217,000			676,000
Nondeductible expenses		(317,000	)		(180,000	)
Valuation allowance – deferred tax assets		(2,645,000	)		(1,575,000	)
Total tax benefit (provision)	$	-		$	-