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Note 4 - Capital Stock, Stock Plans and Stock-based Compensation (Details Textual) - USD ($) |  | 3 Months Ended
--- | --- | ---
Jan. 13, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 6,000 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 3.79 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  | 2.79 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  | $ 14.75 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options |  | $ 83,000 |
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Remainder of Fiscal Year |  | 37,000 |
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Two |  | 33,000 |
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Three |  | 13,000 |
Allocated Share-based Compensation Expense |  | 23,000 | $ 28,000
Employee Stock Option [Member] |  |  |
Allocated Share-based Compensation Expense |  | $ 11,000 | $ 13,000
The 2003 Outside Directors Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0
Stock Issued During Period, Shares, Issued for Services |  | 11,966 |
The 2003 Outside Directors Stock Plan [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Allocated Share-based Compensation Expense |  | $ 53,000 |
The 2003 Outside Directors Stock Plan [Member] | Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 6,000 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 3.79 |  |
The 2003 Outside Directors Stock Plan [Member] | Director [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 180 days |  |

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- Definition Unrecognized cost of unvested options awarded to employees as compensation, to be recognized in the third fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation, to be recognized in the second fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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