Note 4 - Basic and Diluted Net Income (Loss) Per Share - Basic and Diluted Weighted Average Common Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Weighted average common shares outstanding, basic (in shares)	5,638	5,542	5,613	5,542
Dilutive common equivalent shares (in shares)	0	84	0	72
Weighted average common shares outstanding, diluted (in shares)	5,638	5,626	5,613	5,614