Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

	September 30, 2022		December 31, 2021
Cash and cash equivalents	$	8,901	$	21,195
Restricted cash		1,137		-
Total cash, cash equivalents and restricted cash	$	10,038	$	21,195

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Weighted average common shares outstanding - basic		10,695,867		10,496,188		10,655,469		10,422,851
Potentially dilutive securities:
Unvested shares of restricted stock and employee stock options		168,673		296,102		185,175		271,500
Weighted average common shares and common share equivalents outstanding - diluted		10,864,540		10,792,290		10,840,644		10,694,351
Average number of potentially dilutive securities excluded from calculation		518,145		237,545		491,014		283,894