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Note 1 - Summary of Operations and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Research and Development Expense, Gross | $ | $ 7,316 | $ 8,025
Customer Funded Research and Development Expense Included in Cost of Goods Sold | $ | $ 1,369 | $ 1,220
Weighted Average Number Diluted Shares Outstanding Adjustment, Total (in shares) | 193,568 | 396,536
Number of Operating Segments | 2 |
Share-based Payment Arrangement, Option [Member] |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares) | 526,244 | 899,041
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 690,919 | 642,751
Restricted Stock [Member] |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares) | 26,665 | 31,666
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Number of Major Customers | 2 |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 1 [Member] |  |
Concentration Risk, Percentage | 17.00% | 12.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 2 [Member] |  |
Concentration Risk, Percentage | 6.00% | 14.00%
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] |  |
Number of Major Customers | 2 | 2
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Two Customers [Member] | Battery & Energy Products Segment [Member] |  |
Concentration Risk, Percentage | 20.00% | 15.00%
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Two Customers [Member] | Communications Systems Segment [Member] |  |
Concentration Risk, Percentage | 38.00% | 64.00%

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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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