Note 3 - Summary of Significant Accounting Policies (Details Textual) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2019
USD ($)
shares
|
Dec. 31, 2018
USD ($)
shares
|
Jan. 31, 2019
USD ($)
|
|
| Number of Operating Segments | 2 | ||
| Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 10,000 | $ 10,000 | |
| Inventory Valuation Reserves, Ending Balance | 756,000 | 763,000 | |
| Unrecognized Tax Benefits, Ending Balance | $ 0 | 0 | |
| Open Tax Year | 2015 2016 2017 | ||
| Operating Lease, Right-of-Use Asset | $ 129,982 | $ 129,000 | |
| Operating Lease, Liability, Total | $ 129,982 | $ 129,000 | |
| Options and Warrants [Member] | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 8,461,057 | 6,703,553 | |
| Minimum [Member] | |||
| Property, Plant and Equipment, Useful Life | 2 years | ||
| Maximum [Member] | |||
| Property, Plant and Equipment, Useful Life | 7 years |
| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of valuation reserve for inventory. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
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| X | ||||||||||
- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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- Details
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- Details
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