Consolidated Balance Sheets (Parentheticals) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable, allowance for bad debt	$ 471,144	$ 349,535
Property and equipment, accumulated depreciation	775,152	645,115
Intangible assets, accumulated amortization	2,512,203	1,939,957
Deferred financing cost, current	0	43,133
Deferred financing cost, credit facility	245,584	429,769
Deferred financing cost, noncurrent	$ 82,868	$ 0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	65,939,709	63,415,254
Common stock, shares outstanding (in shares)	65,939,709	63,415,254
Series A Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	54,000	54,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	1,946,000	1,946,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0