Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2019	Dec. 31, 2018	[1]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	142,857	142,857
Common stock, shares issued (in shares)	5,954	5,938
Common stock, shares outstanding (in shares)	5,954	5,938

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2018.