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Note 5 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 17, 2015 | Aug. 02, 2013 | Jul. 25, 2011 | Sep. 29, 2010 | Jul. 28, 2004 | Jul. 29, 2003 | May. 31, 2008 | Dec. 31, 2015 | Dec. 31, 2014
Employee Stock Option [Member] | The 2010 Stock Option Plan [Member] | Contractual Term with One-third Yearly Vesting [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Maximum Contractual Term |  |  |  | 6 years |  |  |  |  |  |
Employee Stock Option [Member] | The 2010 Stock Option Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  |  |  |  |
Employee Stock Option [Member] | The 2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  | 180 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  | 10 years |  |  |
Employee Stock Option [Member] | Contractual Term with One-third Yearly Vesting [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  | 3 years |
Share-based Compensation Maximum Contractual Term |  |  |  |  |  |  |  |  | 6 years |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | [1] |  |  |  |  |  |  |  |  | 6 years
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 53,000 | $ 14,000
Incentive Stock Options [Member] | The 2010 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 5 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Stockholder Percentage |  |  |  |  | 10.00% |  |  |  |  |
Non-qualified Stock Options [Member] | The 2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  | 3,423 | 2,577
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 180 days |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  |  |  |  |  |  |  | 3,423 | 2,577
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 4.19 |  |  |  |  |  |  | $ 2.79 | $ 2.79
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  | $ 9,600 | $ 7,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 12,000 |  |  |  |  |  |  |  |
Director Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | [1] |  |  |  |  |  |  |  | 10 years | 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  | 180 days |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 39,000 | $ 48,000
Share-based Compensation Maximum Contractual Term |  |  |  |  |  |  |  |  | 10 years |
The 2010 Stock Option Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term |  |  |  |  | 10 years |  |  |  |  |
The 2010 Stock Option Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  | $ 7.85 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 60,000 |  |  |  |  |  |
The 2010 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  |  | 0 |  |  |  |  |
Percentage of Fair Market Value of Common Stock to Determine Number of Shares to Directors |  |  |  |  | 110.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  | 200,000 |  |  |  |  |
Rights Plan [Member] |  |  |  |  |  |  |  |  |  |
Date of Rights Expiration |  |  |  |  |  |  |  | May 02, 2018 |  |
Common Stock Ownership Percentage Trigger for Share Rights |  |  |  |  |  |  |  | 20.00% |  |
Share Multiplier for Common Stockholders not Part of Non-board Approved Shareholders |  |  |  |  |  |  |  | 2 |  |
Acquired Percentage of the Company that Triggers Share Rights |  |  |  |  |  |  |  | 50.00% |  |
Purchase Price Multiplier for Common Stockholder When Acquired Percentage is Triggered |  |  |  |  |  |  |  | 2 |  |
Purchase Price of Rights |  |  |  |  |  |  |  | $ 13 |  |
Purchase Price for Repurchase of Rights |  |  |  |  |  |  |  | $ 0.001 |  |
The 2003 Outside Directors Stock Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-base Compensation Arrangement by Share-based Payment Award Percentage of Stock in Lieu of Fee Payable |  |  |  |  |  |  | 100.00% |  | 100.00% |
The 2003 Outside Directors Stock Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-base Compensation Arrangement by Share-based Payment Award Percentage of Stock in Lieu of Fee Payable |  |  |  |  |  |  | 65.00% |  | 65.00% |
The 2003 Outside Directors Stock Plan [Member] | Portion of Director Fees Earned in Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 269,000 | $ 273,000
The 2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Percentage of Fair Market Value of Common Stock to Determine Number of Shares to Directors |  |  |  |  |  |  | 75.00% |  | 75.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 800,000 |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  |  |  |  |  |  |  | 71,324 | 67,335
Third Amendment to 2003 Outside Directors Stock Plan [Member] | Reduced to [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Options Granted Upon Initial Election to Board |  |  |  |  |  |  | 6,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Options Granted Upon Re-electionto Board |  |  |  |  |  |  | 2,400 |  |  |
The 2004 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 400,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  |  | 10 years |  |  |  |
Robert Freguson and William Lampson Lenders [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  |  | 2 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 35,000 |  |  |  |  |  | 70,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2.23 |  |  |  |  |  | $ 2.23 |
Class of Warrant or Right, Issued During Period |  |  | 2 |  |  |  |  |  |  |
Due to Related Parties |  |  | $ 3,000,000 |  |  |  |  |  |  |
Warrant Period from Which Warrants or Rights Exercisable |  |  | 180 days |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  | 3,423 | 2,577
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | [2] |  |  |  |  |  |  |  | 169,533 | 167,223
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  |  |  |  |  |  |  | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | [2] |  |  |  |  |  |  |  | 4 years 182 days | 4 years 73 days
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  |  |  |  |  | $ 4.19 | $ 4.70
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 |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 92,000 | $ 34,000
Stock Issued as Consideration for Debt |  |  | 90,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  | 288,200 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  | 12,000 | 71,800
Reduction in Stock-based Compensation Expense |  |  |  |  |  |  |  |  |  | $ 54,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  |  |  |  |  |  | $ 86,000 |
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Not Yet Recognized, Next Twelve Months |  |  |  |  |  |  |  |  | 67,000 |
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost not yet Recognized in Year Two |  |  |  |  |  |  |  |  | $ 19,000 |
[1] | The expected option life is based on historical exercises and post-vesting data.
[2] | Options with exercise prices ranging from $2.79 to $14.75

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- Definition Percentage of fair market value of common stock to determine the number of shares to directors. + References No definition available. + Details
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- Definition Number of options to purchase common stock granted to each board member upon initial election to the board of directors. + References No definition available. + Details
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- Definition Number of options to purchase common shares granted to each board member upon re-election to the board of directors. + 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=6415400&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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling 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=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -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 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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