Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Convertible Preferred Stock, Par Value (in dollars per share)	$ 0.00067	$ 0.00067
Convertible Preferred Stock, Shares Authorized (in shares)	50,000,000	50,000,000
Convertible Preferred Stock, Shares Issued (in shares)	0	0
Convertible Preferred Stock, Shares Outstanding (in shares)	0	0
Common Stock, Par Value (in dollars per share)	$ 0.00067	$ 0.00067
Common Stock, Shares Authorized (in shares)	400,000,000	400,000,000
Common Stock, Shares Issued (in shares)	166,256,024	141,466,071