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Note 1 - Summary of Operations and Significant Accounting Policies 1 (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares
Capitalized Contract Cost, Gross | $ 0 | $ 0
Research and Development Expense, Gross | 8,587 | 7,874
Customer Funded Research and Development Expense Included in Cost of Goods Sold | $ 1,056 | $ 793
Number of Operating Segments | 2 |
Share-Based Payment Arrangement, Option [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 111,247 | 1,425,693
Restricted Stock [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 4,029 | 2,500
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements | shares | 0 |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Number of Major Customers | 1 | 1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 1 [Member] |  |
Concentration Risk, Percentage | 15.00% | 17.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 1 [Member] | Battery & Energy Products Segment [Member] |  |
Concentration Risk, Percentage | 18.00% | 19.00%
Minimum [Member] |  |
Standard Product Warranty, Period | 90 days |
Maximum [Member] |  |
Standard Product Warranty, Period | 3 years |
Extended Warranty Contracts [Member] |  |
Extended Product Warranty, Period | 8 years |
Revenue, Remaining Performance Obligation, Amount | $ 1,407 |

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- Definition The gross costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References No definition available. + Details
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