Note 8 - Stock Based Compensation - Stock Option Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Non-Exercisable, balance (in shares)	175,952	263,928
Non-Exercisable, weighted average price (in dollars per share)	$ 24.00	$ 24.00
Granted, shares (in shares)	0	0
Exercisable, shares (in shares)	0	0
Exercisable, weighted average exercise price (in dollars per share)	$ 0	$ 0
Non-Exercisable, weighted average price (in dollars per share)	$ 24.00	$ 24.00
Non-Exercisable, balance (in shares)	175,952	263,928