Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Account Summary (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Beginning of period			$ 116,834	$ 186,085	$ 186,085
Bad debt expense	$ 33,455	$ 14,972	33,307	$ (5,402)	14,939
Write-offs			(24,548)		(84,190)
End of period	$ 125,593		$ 125,593		$ 116,834