Note 2 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

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

	June 30, 2023		December 31, 2022
Cash and cash equivalents	$	37,435	$	13,434
Restricted cash		-		1,142
Total cash, cash equivalents and restricted cash	$	37,435	$	14,576

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Weighted average common shares outstanding - basic		11,241,183		10,653,268		10,998,456		10,635,270
Potentially dilutive securities:
Unvested shares of restricted stock and employee stock options		455,386		161,531		394,161		193,426
Weighted average common shares and common share equivalents outstanding - diluted		11,696,569		10,814,799		11,392,617		10,828,696
Average number of potentially dilutive securities excluded from calculation because their effect was anti-dilutive during the period		96,661		608,322		125,545		477,448