Note 7 - Line of Credit, Notes Payable and Liquidity - Notes Payable (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017	Mar. 18, 2013
Debt Instrument, Interest Rate, Stated Percentage			2.00%
Ending principal	$ 1,102,500	$ 1,102,500
Discount on notes payable
Short-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Discount on notes payable	0	0
Short-term Debt [Member] \| Non-Related Party [Member]
Ending principal	0	0
Discount on notes payable	0	0
Long-term Debt [Member] \| Related Party [Member]
Ending principal	306,108	282,635
Discount on notes payable	(93,892)	(117,365)
Long-term Debt [Member] \| Non-Related Party [Member]
Ending principal	454,143	423,098
Discount on notes payable	$ (248,357)	$ (279,402)
Notes Payable, Matures April 1, 2019 [Member]
Maturity date	Apr. 01, 2019	Apr. 01, 2019
Debt Instrument, Interest Rate, Stated Percentage	12.00%	12.00%
Ending principal	$ 400,000	$ 400,000
Notes Payable, Matures April 1, 2019 [Member] \| Short-term Debt [Member] \| Non-Related Party Current [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2019 [Member] \| Short-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2019 [Member] \| Long-term Debt [Member] \| Non-Related Party Current [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2019 [Member] \| Long-term Debt [Member] \| Related Party [Member]
Ending principal	$ 400,000	$ 400,000
Notes Payable, Matures April 1, 2020 I [Member]
Maturity date	Apr. 01, 2020	Apr. 01, 2020
Debt Instrument, Interest Rate, Stated Percentage	10.00%	10.00%
Ending principal	$ 420,000	$ 420,000
Notes Payable, Matures April 1, 2020 I [Member] \| Short-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2020 I [Member] \| Short-term Debt [Member] \| Non-Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2020 I [Member] \| Long-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2020 I [Member] \| Long-term Debt [Member] \| Non-Related Party [Member]
Ending principal	$ 420,000	$ 420,000
Notes Payable, Matures April 1, 2020 II [Member]
Maturity date	Apr. 01, 2020	Apr. 01, 2020
Debt Instrument, Interest Rate, Stated Percentage	12.00%	12.00%
Ending principal	$ 282,500	$ 282,500
Notes Payable, Matures April 1, 2020 II [Member] \| Short-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2020 II [Member] \| Short-term Debt [Member] \| Non-Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2020 II [Member] \| Long-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Notes Payable, Matures April 1, 2020 II [Member] \| Long-term Debt [Member] \| Non-Related Party [Member]
Ending principal	$ 282,500	$ 282,500

Contractual interest rate for funds borrowed, under the debt agreement.

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