Note 8 - Preferred Stock and Common Stock Warrants (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Allocation of Net Cash Proceeds [Table Text Block]

			Allocation of Proceeds
					Series C
			Series C		Preferred
			Warrants		Stock
Gross proceeds	$	34,500
Equity issuance costs		61
Net proceeds - Initial Fair Value Allocation	$	34,439	$	1,266	$	33,173
Per balance sheet upon issuance			$	1,266	$	33,173

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

	June 30,			December 31,
	2021			2020
Stock price	$	4.13		$	2.09
Exercise price	$	0.01		$	0.01
Risk-free rate		0.1	%		0.1	%
Volatility		58.4	%		58.6	%
Term (years)		0.9			0.8