Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Account Summary (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Beginning of period	$ 116,834	$ 186,085
Bad debt expense	132,767	14,939
Write-offs	(69,788)	(84,190)
End of period	$ 179,813	$ 116,834