Note 11 - Employee Stock Purchase Plan (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						6 Months Ended	9 Months Ended		24 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Jun. 23, 2021
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 42	$ 49	$ 48	$ 55	$ 65	$ 56
Share Price (in dollars per share)	$ 15.17	$ 26.26	$ 20.74					$ 15.17		$ 15.17
Share-based Compensation Arrangement by Share-based Payment Award, Discount Amount								$ 21	$ 28
Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)										38,077
Stock Issued During Period, Value, Employee Stock Purchase Plan										$ 358
Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date							15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount Amount									$ 28
Share-Based Payment Arrangement, Expense										$ 63
Employee Stock Purchase Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)											250,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)								6,925	21,749
Stock Issued During Period, Value, Employee Stock Purchase Plan								$ 118	$ 148
Share Price (in dollars per share)				$ 7.63	$ 6.82	$ 10.73	$ 6.82		$ 7.63
Shares Issued, Price Per Share (in dollars per share)	$ 12.89	$ 22.32	$ 17.63	$ 6.49	$ 5.8	$ 9.12	$ 5.8	$ 12.89	$ 6.49	$ 12.89
Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date								15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount Amount									$ 21