Note 6 - Per Share Amounts (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	78,000	0	79,000	0
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	41,000	48,000	41,000	42,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		21,000		21,000
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares)	124,000	1,000	138,000	10,000