Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Operating Segments	2
Number of Subsidiaries	4
Contract with Customer, Liability, Total	$ 949,000	$ 863,000
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
Power Supplies and Repair Warranty, Term	3 years
Advertising Expense	$ 82,000	$ 92,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
XLS and RLS Libraries [Member]
Advance Replacement Warranty Period	3 years
Q-Series Libraries [Member]
Advance Replacement Warranty Period	2 years
North America [Member] \| XLS Libraries [member]
Warranty, Onsite Service Period	1 year
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Largest Customer [Member]
Concentration Risk, Percentage	23.50%	12.60%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Outside North America [Member]
Concentration Risk, Percentage	58.80%	43.10%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Largest Customer [Member]
Concentration Risk, Percentage	23.40%	2.00%

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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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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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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 over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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