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Note 1 - Summary of Operations and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Research and Development Expense, Gross	$ 8,042	$ 7,316
Customer Funded Research and Development Expense Included in Cost of Goods Sold	$ 1,216	$ 1,369
Weighted Average Number Diluted Shares Outstanding Adjustment, Total (in shares)		193,568
Restricted Stock [Member]
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares)	0	26,665
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	11,664
Share-based Payment Arrangement, Option [Member]
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total (in shares)	0	526,244
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1,306,824	690,919
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 1 [Member]
Concentration Risk, Percentage	20.00%	17.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Large Defense Primary Contractor, 1 [Member] | Battery & Energy Products Segment [Member]
Concentration Risk, Percentage	22.00%
Customer Concentration Risk [Member] | Revenue, Segment Benchmark [Member] | Two Customers [Member] | Battery & Energy Products Segment [Member]
Concentration Risk, Percentage		20.00%

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- Definition

Represents the amount of R&D included in cost of goods sold that is customer funded.

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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.

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