Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 176,220	$ 149,980
Notes payable discount
Preferred stock, par value (in dollars per share)	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	155,368,647	148,542,805
Common stock, shares outstanding (in shares)	155,368,647	148,542,805
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	230,000	230,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, liquidation preference	$ 0	$ 0
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	747,500	747,500
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, liquidation preference	$ 0	$ 0
Series D Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	250,000	250,000
Preferred stock, shares issued (in shares)	250,000	250,000
Preferred stock, shares outstanding (in shares)	250,000	250,000
Related Party Long Term [Member]
Notes payable discount, noncurrent	$ 0	$ 117,365
Notes Payable, Other Payables [Member]
Notes payable discount	$ 123,184	$ 279,402