Note 7 - Line of Credit, Notes Payable and Liquidity - Notes Payable (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018	Mar. 18, 2013
Debt Instrument, Interest Rate, Stated Percentage			2.00%
Ending principal	$ 320,000	$ 557,500
Discount on notes payable
Short-term Debt [Member] \| Non-Related Party [Member]
Ending principal	277,576	0
Discount on notes payable	(42,424)	0
Short-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Discount on notes payable	0	0
Long-term Debt [Member] \| Non-Related Party [Member]
Ending principal	0	434,316
Discount on notes payable	0	(123,184)
Long-term Debt [Member] \| Related Party [Member]
Ending principal	0	0
Discount on notes payable	$ 0	$ 0
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	$ 320,000	$ 420,000
Notes Payable, Matures April 1, 2020 I [Member] \| Short-term Debt [Member] \| Non-Related Party [Member]
Ending principal	320,000	0
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] \| Long-term Debt [Member] \| Non-Related Party [Member]
Ending principal	0	420,000
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 II [Member]
Maturity date		Apr. 01, 2020
Debt Instrument, Interest Rate, Stated Percentage		12.00%
Ending principal		$ 137,500
Notes Payable, Matures April 1, 2020 II [Member] \| Short-term Debt [Member] \| Non-Related Party [Member]
Ending principal		0
Notes Payable, Matures April 1, 2020 II [Member] \| Short-term Debt [Member] \| Related Party [Member]
Ending principal		0
Notes Payable, Matures April 1, 2020 II [Member] \| Long-term Debt [Member] \| Non-Related Party [Member]
Ending principal		137,500
Notes Payable, Matures April 1, 2020 II [Member] \| Long-term Debt [Member] \| Related Party [Member]
Ending principal		$ 0

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

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