Note 7 - Convertible Debt

12 Months Ended

Dec. 31, 2018

Notes to Financial Statements

Debt Disclosure [Text Block]

7.

 Convertible Debt

The components of debt outstanding at

December 

31,

2017

was as follows:

	December 31, 2017
Series B convertible notes		550,000
Less current portion		(550,000	)
Long-term debt, net of current portion	$	—

Upon maturity of the Series B convertible debt during the

second

quarter of

2018,

the Company repaid the outstanding principal and interest of approximately

$0.6

million and

$40,000,

respectively. As such, the Company does

not

have any debt outstanding as of

December 31, 2018.

For the years ended

December 31, 2018

and

2017,

the Company recognized interest expense of approximately

$3,000

and

$0.1

million, respectively in connection with its convertible debt instruments. Accrued interest was

$37,000

as of

December 31, 2017.