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Note 1 - Summary of Significant Accounting Policies - Option Activity (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 362,640
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 3.96
Granted (in shares) | shares 3,000
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 5.76
Exercised (in shares) | shares (1,000)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 3.70
Cancelled (in shares) | shares (9,140)
Cancelled, weighted average exercise price (in dollars per share) | $ / shares $ 3.41
Outstanding (in shares) | shares 355,500
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 3.99
Outstanding, weighted average remaining contractual term (Year) 7 years 3 months 18 days
Outstanding, aggregate intrinsic value | $ $ 1,422
Exercisable (in shares) | shares 194,100
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 3.71
Exercisable, weighted average remaining contractual term (Year) 6 years 9 months 7 days
Exercisable, aggregate intrinsic value | $ $ 827