Note 1 - Overview and Summary of Significant Accounting Policies - Diluted Common Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Basic (in shares)	13,720	13,607	13,699	13,591
Dilutive effects of unvested restricted stock and stock options (in shares)	97	84	80	95
Weighted average number of common shares used in diluted net income per common share (in shares)	13,817	13,691	13,779	13,686