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Note 3 - Summary of Significant Accounting Policies (Details Textual) |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 27, 2020 USD ($) | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 shares | Dec. 31, 2020 USD ($)
Number of Operating Segments |  | 2 |  |
Short-term Investments, Total |  | $ 15,000,000 |  | $ 13,100,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  | 10,000 |  | 10,000
Inventory Valuation Reserves, Ending Balance |  | 450,000 |  | 453,000
Unrecognized Tax Benefits, Ending Balance |  | 0 |  | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  | $ 0 |  |
Options and Warrants [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  | 6,092,193 | 1,875,886 |
Paycheck Protection Program CARES Act [Member] |  |  |  |
Proceeds from Notes Payable, Total | $ 276,000 |  |  |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 2 years |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 7 years |  |

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