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

3 Months Ended

Mar. 31, 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	$	24,500
Equity issuance costs		54
Net proceeds - Initial Fair Value Allocation	$	24,446	$	817	$	23,629
Per balance sheet upon issuance			$	817	$	23,629

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

	March 31,			December 31,
	2021			2020
Stock price	$	2.67		$	2.09
Exercise price	$	0.01		$	0.01
Risk-free rate		0.1	%		0.1	%
Volatility		35.8	%		58.6	%
Term (years)		1.0			0.8