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Note 3 - Summary of Significant Accounting Policies (Details Textual) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) shares | Jan. 01, 2019 USD ($)
Number of Operating Segments | 2 |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 10,000 |  | $ 10,000 |
Inventory Valuation Reserves, Ending Balance | 754,000 |  | 763,000 |
Unrecognized Tax Benefits, Ending Balance | 0 |  | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | $ 0 | $ 0 |  |
Open Tax Year | 2015 2016 2017 |  |  |
Operating Lease, Right-of-Use Asset | $ 92,830 |  |  | $ 166,292
Operating Lease, Liability, Total | $ 92,830 |  |  | $ 166,292
Options and Warrants [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 5,053,832 |  | 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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