Note 10 - Convertible Note (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	As of
Assumption	March 26, 2019
Stock price (latest bid price)	$	1.28
Equity volatility		93.8	%
Risk-free interest rate		2.34	%
Remaining term		1.5

	As of
Assumption	December 31, 2019
Stock price	$	0.65
Equity volatility		192.6	%
Risk-free interest rate		1.60	%
Remaining term		0.74

Convertible Debt [Table Text Block]

(in thousands)
Principal amount	$	1,563
Unamortized discount		(117	)
Unamortized debt issuance costs		(37	)
Total debt		1,409
Less: short-term		1,409
Long-term	$	—

Schedule of Maturities of Long-term Debt [Table Text Block]

(in thousands)
2020	$	1,563
2021 and thereafter		—
Total	$	1,563