Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	December 31,
	2022		2021
Cash and cash equivalents	$	13,434	$	21,195
Restricted cash		1,142		-
Total cash, cash equivalents and restricted cash	$	14,576	$	21,195

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

	Years Ended December 31,
	2022		2021
Weighted average common shares outstanding–basic		10,673,017		10,462,246
Potentially dilutive securities:
Unvested shares of restricted stock and employee stock options		189,521		267,616
Weighted average common shares and common share equivalents outstanding–diluted		10,862,538		10,729,862
Average number of potentially dilutive securities excluded from calculation		478,024		231,938