Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Supplemental Disclosure for Statements of Cash Flows

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Note 16 - Supplemental Disclosure for Statements of Cash Flows
6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Cash Flow, Supplemental Disclosures [Text Block]
16.
Supplemental Disclosure for Statements of Cash Flows
 
During the
six
-month periods ended
June 30, 2018
and
2017,
we paid interest aggregating
$4,000
and
$7.4
million, respectively. During the
six
-month periods ended
June 30, 2018
and
2017,
we issued
94,684
and
105,308
shares of our common stock as matching contributions to our
401
(k) Plan which were valued at
$36,000
and
54,000,
respectively. During the
six
-month period ended
June 30, 2017,
we issued
1.0
million Series NN warrants to UCSD with an estimated fair value of
$334,000.