Consolidated Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	6,363,371	6,363,371
Common stock, shares outstanding (in shares)	6,363,371	6,363,371
Common stock, shares unvested (in shares)	4,961	4,961