Note 11 - Stock Compensation Plans - Stock Options Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Exercised (in shares)	0
Stock Options [Member]
Outstanding (in shares)	253,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.78
Granted (in shares)	50,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 6.57
Exercised (in shares)	0
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Canceled/Expired (in shares)	(153,000)
Canceled/Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 12.53
Outstanding (in shares)	150,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 5.90
Outstanding, weighted average remaining life (Year)	8 years 2 months 4 days
Outstanding, aggregate intrinsic value | $	$ 243
Vested (in shares)	150,000
Vested, weighted average exercise price (in dollars per share) | $ / shares	$ 5.90
Vested, weighted average remaining life (Year)	8 years 2 months 4 days
Vested, aggregate intrinsic value | $	$ 243
Exercisable (in shares)	150,000
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 5.90
Exercisable, weighted average remaining life (Year)	8 years 2 months 4 days
Exercisable, aggregate intrinsic value | $	$ 243