Note 2 - Income Per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Restricted Stock [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	235,000	237,000	251,000	252,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0	0		0
Restricted Stock [Member] | Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)			1,000
Share-Based Payment Arrangement, Option [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	400,000	10,000	365,000	11,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0	33,000	35,000	33,000