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Note 1 - Summary of Significant Accounting Policies - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Outstanding (in shares) 372,200 372,200
Outstanding, weighted average exercise price per share (in dollars per share) $ 3.85 $ 3.85
Granted (in shares) 11,300 11,300
Granted, weighted average exercise price per share (in dollars per share)   $ 2.95
Cancelled (in shares)   (4,000)
Cancelled, weighted average exercise price per share (in dollars per share)   $ 3.29
Outstanding (in shares)   379,500
Outstanding, weighted average exercise price per share (in dollars per share)   $ 3.83
Outstanding, weighted average remaining contractual term (Year)   8 years 47 days
Outstanding, aggregate intrinsic value   $ 218
Exercisable (in shares)   182,240
Exercisable, weighted average exercise price per share (in dollars per share)   $ 3.72
Exercisable, weighted average remaining contractual term (Year)   7 years 255 days
Exercisable, aggregate intrinsic value   $ 119