Note 6 - Per Share Amounts (Details Textual) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	166,000	98,000
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	6,000	50,000
Restricted Stock [Member]
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	123,000	123,000