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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 |  |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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