Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2019
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 10,000	$ 10,000
Inventory Valuation Reserves, Ending Balance	752,000	763,000
Unrecognized Tax Benefits, Ending Balance	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	0	0
Operating Lease, Right-of-Use Asset	$ 54,818		$ 166,292
Open Tax Year	2015 2016 2017
Operating Lease, Liability, Total	$ 54,817		$ 166,292
Options and Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		6,703,553
Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	7 years

Amount of allowance for credit loss on accounts receivable.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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