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v3.23.1

Note 1 - Summary of Operations and Significant Accounting Policies 1 (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Capitalized Contract Cost, Gross | $ | $ 0 | $ 0
Research and Development Expense, Gross | $ | 7,874 | 8,042
Customer Funded Research and Development Expense Included in Cost of Goods Sold | $ | $ 793 | $ 1,216
Number of Operating Segments | 2 |
Share-Based Payment Arrangement, Option [Member] |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements | shares | 0 | 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 1,425,693 | 1,306,824
Restricted Stock [Member] |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements | shares | 0 | 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 2,500 | 11,664
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 | 17.00% | 20.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 1 [Member] | Battery & Energy Products Segment [Member] |  |
Concentration Risk, Percentage | 19.00% | 22.00%
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 | $ | $ 682 |

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