Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Common stock, par value (in dollars per share)	$ 0.02	$ 0.02
Common stock, shares authorized (in shares)	35,000,000	25,000,000
Common stock, shares issued (in shares)	14,946,839	14,712,377
Common stock, shares outstanding (in shares)	14,946,839	14,712,377