Note 5 - Debt	12 Months Ended
Dec. 31, 2020
Notes to Financial Statements
Debt Disclosure [Text Block]	NOTE 5. DEBT Term Loan Facility On August 9, 2017, the Company entered into a Loan and Security Agreement with Silicon Valley Bank (“SVB”) that provides for a Term Loan Facility (the “Term Loan Facility” and all amounts borrowed thereunder, the “Term Loan”). Under the Term Loan Facility, the Company borrowed an initial amount of $7.5 million. The Company had the right to borrow an additional $7.5 million on or before December 31, 2018; this right expired unexercised. The Term Loan Facility carried interest at a floating rate of 4.0% above the prime rate per annum (for a total interest rate of 7.25% at December 31, 2020), with interest payable monthly. The monthly payments consisted of interest-only for the first 18 months, after which the Term Loan was payable in 24 equal monthly installments of principal, plus accrued interest. All outstanding principal and accrued and unpaid interest under the Term Loan was due and paid on February 9, 2021. The Term Loan may not be reborrowed. In connection with entry into the Term Loan Facility, the Company issued to SVB and one of its affiliates, stock purchase warrants to purchase an aggregate of 58,502 shares of the Company's common stock at an exercise price of $6.41 per share. The warrants are immediately exercisable, have a 10 -year term, contain a cashless exercise provision, and are classified in equity. The relative fair value of the warrants, net of issuance costs, which was recorded as debt discount of $304,201 on the date of issuance. At December 31, 2020 and 2019, $0.6 million and $4.4 million, respectively, of face value of the Term Loan was presented in the accompanying consolidated balance sheets net of current unamortized discounts and issuance costs of $2,735 and $91,879, and long-term unamortized discounts and issuance costs of $0 and $2,735, respectively. Total interest expense recognized for the years ended December 31, 2020 and 2019 was $0.4 million and $1.0 million, respectively.

NOTE

DEBT

Term Loan Facility

August 9, 2017,

the Company entered into a Loan and Security Agreement with Silicon Valley Bank (“SVB”) that provides for a Term Loan Facility (the “Term Loan Facility” and all amounts borrowed thereunder, the “Term Loan”). Under the Term Loan Facility, the Company borrowed an initial amount of

$7.5

million. The Company had the right to borrow an additional

$7.5

million on or before

December 31, 2018;

this right expired unexercised.

The Term Loan Facility carried interest at a floating rate of

4.0%

above the prime rate per annum (for a total interest rate of

7.25%

December 31, 2020),

with interest payable monthly. The monthly payments consisted of interest-only for the

first

months, after which the Term Loan was payable in

equal monthly installments of principal, plus accrued interest. All outstanding principal and accrued and unpaid interest under the Term Loan was due and paid on

February 9, 2021.

The Term Loan

may

not

be reborrowed.

In connection with entry into the Term Loan Facility, the Company issued to SVB and

one

of its affiliates, stock purchase warrants to purchase an aggregate of

58,502

shares of the Company's common stock at an exercise price of

$6.41

per share. The warrants are immediately exercisable, have a

-year term, contain a cashless exercise provision, and are classified in equity. The relative fair value of the warrants, net of issuance costs, which was recorded as debt discount of

$304,201

on the date of issuance.

December 31, 2020

and

2019,

$0.6

million and

$4.4

million, respectively, of face value of the Term Loan was presented in the accompanying consolidated balance sheets net of current unamortized discounts and issuance costs of

$2,735

and

$91,879,

and long-term unamortized discounts and issuance costs of

and

$2,735,

respectively. Total interest expense recognized for the years ended

December 31, 2020

and

2019

was

$0.4

million and

$1.0

million, respectively.