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Note 7 - Stock Based Compensation - Summary of Stock Options (Details)
shares in Thousands
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
Outstanding, shares (in shares) | shares 13
Outstanding, Weighted average exercise price per shar (in dollars per share) | $ / shares $ 5.47
Outstanding, Weighted average grant date fair value 2.98
Granted, shares (in shares) | shares 0
Granted, Weighted average exercise price per shar (in dollars per share) | $ / shares $ 0
Granted, Weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Outstanding, shares (in shares) | shares 13
Outstanding, Weighted average grant date fair value 2.98