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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | May 31, 2018
Contingent Liability, Repayment of State and Local Grant Funds Received | $ 463 | $ 200 |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
City of Rochester and State of New York [Member] |  |  |
Covenant, Future Amount Receivable | $ 87 |  | $ 550
Thermal Products and Mechanical Products [Member] |  |  |
Equipment Leased To Customers Initial Term | 180 days |  |

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