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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019 | Jul. 01, 2015
Letters of Credit Outstanding, Amount | $ 0 |  |  |
Restricted Cash and Cash Equivalents, Current, Total | 309 | $ 467 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 335 | 222 |  |
Amortization of Intangible Assets, Total | $ 219 | $ 219 |  |
Preferred Stock, Dividend Rate, Percentage | 12.00% |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 1 |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0 | $ 0 |  |
Advertising Expense | $ 101 | $ 132 |  |
Business Combination, Contingent Consideration, Liability, Total | 0 | 34 |  |
Goodwill, Ending Balance | 2,375 | 2,375 |  |
Goodwill, Impaired, Accumulated Impairment Loss | 908 | 908 |  |
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease), Total | (24) |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance | 257 | (233) |  |
Foreign Currency Transaction Gain (Loss), before Tax, Total | 11 | (170) |  |
Operating Lease, Liability, Total | 5,224 |  |  |
Operating Lease, Right-of-Use Asset | $ 4,827 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Liability, Total |  |  | $ 5,731 |
Operating Lease, Right-of-Use Asset |  |  | $ 5,731 |
Revenue Benchmark [Member] | Product Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage | 4.80% | 3.10% |  |
Devicix, LLC [Member] |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  | $ 2,500

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