Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2022	Dec. 31, 2021	[1]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	23,910,857	23,971,347
Common stock, outstanding (in shares)	16,781,975	16,878,220
Undesignated Par Value [Member]
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Designated Par Value [Member]
Preferred stock, authorized (in shares)	25,000	25,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, outstanding (in shares)	0	0

[1] Derived from audited financial statements