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Note 1 - Summary of Operations and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Research and Development Expense, Gross | $ | $ 4,905 | $ 5,142
Customer Funded Research and Development Expense Included in Cost of Goods Sold | $ | 397 | 405
Research and Development, Revenue | $ | $ 397 | $ 405
Weighted Average Number Diluted Shares Outstanding Adjustment, Total | 465,004 |
Number of Operating Segments | 2 |
Employee Stock Option [Member] |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total | 1,127,837 | 1,035,711
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 448,250 | 824,500
Restricted Stock [Member] |  |
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total | 17,500 | 330,676
Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  | 0
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |
Number of Major Customers | 1 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Large Defense Primary Contractor, 1 [Member] |  |
Concentration Risk, Percentage | 16.00% | 18.00%

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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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