Note 7 - Debt - Schedule of Debt (Details) (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	May 15, 2011
Debt Instrument, Interest Rate, Stated Percentage			10.00%
The 2009 Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Face Amount	$ 189,185	$ 199,790
Debt instrument, term (Month)	1 year
The November 2010 Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Face Amount	$ 1,877,162	$ 1,877,162
Debt instrument, term (Month)	1 year
WL Meyer Legacy Trust (formerly CMS Acquisition LLC) [Member]
Debt Instrument, Face Amount	$ 72,696	$ 77,696
WL Meyer Legacy Trust (formerly CMS Acquisition LLC) [Member] \| Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
WL Meyer Legacy Trust (formerly CMS Acquisition LLC) [Member] \| Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage	10.00%	10.00%
The May 2012 Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Face Amount	$ 583,510	$ 583,510
Debt instrument, term (Month)	1 year 180 days	1 year 180 days
The February 2014 Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Face Amount	$ 100,000	$ 100,000
Debt instrument, term (Month)	1 year 180 days	1 year 180 days
The 2015 Offering [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Face Amount	$ 85,000	$ 85,000
Debt instrument, term (Month)	1 year 180 days	1 year 180 days
The June 2016 Note Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%
Debt Instrument, Face Amount	$ 50,000	$ 50,000
Debt instrument, term (Month)	180 days	180 days
October 2016 Promissory Note Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%
Debt Instrument, Face Amount	$ 35,000	$ 35,000
Debt instrument, term (Month)	180 days	180 days
January 2017 Promissory Note Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Debt Instrument, Face Amount	$ 15,000	$ 15,000
October 2018 Promissory Note Payable [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Debt Instrument, Face Amount	$ 25,000

CleanTech Biofuels, Inc. 10-K