Note 1 - Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Number of Operating Segments	2
Product Return Period	5 days
Contract with Customer, Liability, Total	$ 863,000	$ 927,000
Deferred Profit	0	0
Restricted Cash and Cash Equivalents, Current, Total	100,000	100,000
Impairment of Long-Lived Assets Held-for-use	$ 0	0
Advance Replacement Warranty Period	3 years
Warranty, Onsite Service Period	1 year
Power Supplies and Repair Warranty, Term	3 years
Advertising Expense	$ 92,000	$ 49,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Accounting Standards Update 2016-02 [Member] \| Scenario, Forecast [Member]
Operating Lease, Liability, Total			$ 500
Operating Lease, Right-of-Use Asset			$ 500
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Largest Customer [Member]
Concentration Risk, Percentage	12.60%	13.20%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Outside North America [Member]
Concentration Risk, Percentage	43.10%	3770.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Largest Customer [Member]
Concentration Risk, Percentage	2.00%	9.30%

Represents the period covered by the advance replacement warranty.

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Profit which has not yet been recognized.

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Represents the term of the warranty term for all power supplies, which warranty includes repair or, if necessary, replacement of the power supply.

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Represents the period of time following shipment during which customers are generally allowed to return the product, free of penalty, if the product does not conform to its specifications.

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Represents the term of the onsite service period associated with the warranty.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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