Annual report pursuant to Section 13 and 15(d)

Note 11 - Share-based Compensation - Summary of Activity Relating to Company's ESPP Program (Details)

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Note 11 - Share-based Compensation - Summary of Activity Relating to Company's ESPP Program (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Compensation expense $ 33,874 $ 49,150
Shares of stock sold to employees (in shares) 43,433 68,958
Weighted average fair value per ESPP award (in dollars per share) $ 2.45 $ 2.21