CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	20,000,000		20,000,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001
Common stock, shares authorized	750,000,000		750,000,000
Common stock, shares issued	41,673,655		41,673,655
Common stock, shares outstanding	41,673,655		41,673,655
Series A convertible preferred stock
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	3,437,500		3,437,500
Preferred stock, shares issued	1,270,250		1,270,250
Preferred stock, shares outstanding	1,270,250	1,270,250	1,270,250	1,276,750	1,276,750	1,276,750
Preferred stock, liquidation value (in dollars)	$ 12,702,500		$ 12,702,500
Series B convertible preferred stock
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	11,000,000		11,000,000
Preferred stock, shares issued	5,307,212		5,307,212
Preferred stock, shares outstanding	5,307,212	5,307,212	5,307,212	5,307,212	5,307,212	5,307,212
Preferred stock, liquidation value (in dollars)	$ 15,921,636		$ 15,921,636
Series C convertible preferred stock
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized	4,000,000		4,000,000
Preferred stock, shares issued	1,254,175		1,254,175
Preferred stock, shares outstanding	1,254,175	1,254,175	1,254,175	1,254,175	1,254,175	1,254,175
Preferred stock, liquidation value (in dollars)	$ 6,270,875		$ 6,270,875