Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value per share (in dollars per share)	$ 0.002	$ 0.002
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share (in dollars per share)	$ 0.002	$ 0.002
Common stock, shares authorized	450,000,000	450,000,000
Common stock, shares, issued	36,673,272	36,600,457
Common stock, shares outstanding	36,673,272	36,600,457