Note 6 - Per Share Amounts (Details Textual) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	66,000	39,000	70,000	38,000
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	118,000		91,000
Restricted Stock [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	123,000	123,000	123,000	123,000