Note 11 - Stock Options and Restricted Stock Awards - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Outstanding, options (in shares)	406,000	455,000
Outstanding, weighted average exercise price (in dollars per share)	$ 43.51
Outstanding, weighted average remaining contractual term (Year)	2 years 10 months 24 days	3 years 2 months 12 days
Granted, options (in shares)	0	0	0
Granted, weighted average exercise price (in dollars per share)	$ 0
Exercised, options (in shares)	(110,000)
Exercised, weighted average exercise price (in dollars per share)	$ 22.52
Forfeited, options (in shares)	0
Forfeited, weighted average exercise price (in dollars per share)	$ 0
Outstanding, options (in shares)	296,000	406,000	455,000
Outstanding, weighted average exercise price (in dollars per share)	$ 51.31	$ 43.51
Exercisable, options (in shares)	286,000
Exercisable, weighted average exercise price (in dollars per share)	$ 50.08
Exercisable, weighted average remaining contractual term (Year)	2 years 9 months 18 days