Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Schedule of Cash, Cash Equivalents and Restricted Cash [Table Text Block]

	March 31, 2023		December 31, 2022
Cash and cash equivalents	$	15,428	$	13,434
Restricted cash		516		1,142
Total cash, cash equivalents and restricted cash	$	15,944	$	14,576

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three Months Ended March 31,
	2023		2022
Weighted average common shares outstanding–basic		10,755,729		10,617,271
Potentially dilutive securities:
Unvested shares of restricted stock and employee stock options		332,935		225,321
Weighted average common shares and common share equivalents outstanding–diluted		11,088,664		10,842,592
Average number of potentially dilutive securities excluded from calculation		154,429		318,574