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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2018
Accounts Receivable, Credit Loss Expense (Reversal) | $ 3 | $ 20 |
Inventory Write-down | 391 | 285 |
Depreciation, Total | 685 | 768 |
Contingent Liability, Repayment of State and Local Grant Funds Received | 463 | 200 |
Foreign Currency Transaction Gain (Loss), before Tax, Total | (3) | $ (165) |
City of Rochester and State of New York [Member] |  |  |
Covenant, Future Amount Receivable | $ 87 |  | $ 550
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 1 year |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Thermal Products and Mechanical Products [Member] |  |  |
Equipment Leased To Customers Initial Term | 180 days |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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