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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts Receivable, Credit Loss Expense (Reversal) | $ 0 | $ 3
Number of Operating Segments | 2 |
Number of Reportable Segments | 2 |
Inventory Write-down | $ 444 | 391
Depreciation, Total | 630 | 685
Deferred Grant Proceeds | 27 |
Foreign Currency Transaction Gain (Loss), before Tax, Total | (26) | $ (3)
City of Rochester and State of New York [Member] |  |
Contingent Liability, Repayment of State and Local Grant Funds Received | 463 |
Covenant, Future Amount Receivable | $ 423 |
Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 1 year |
Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121605123&loc=d3e30226-110892 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=120253306&loc=d3e28228-110885 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 + Details
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