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Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) - USD ($) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 25, 2011 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 |  | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 221,635 | [1] | 300,800 | [1] | 239,023 | 362,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  | 212,835 |  | 300,800 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 7.91 | [1] | $ 9.85 | [1] | $ 7.81 | $ 9.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | [1] |  | 4 years 255 days |  | 2 years 292 days |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share) |  |  | $ 2.79 |  | $ 2.79 |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share) |  |  | 14.75 |  | $ 14.75 |  |  |
Reduction in Stock Based Compensation Expense (in Dollars) |  |  |  |  | $ 54,000 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 0 |  | $ 0 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) |  |  | $ 99,000 |  |  |  |  |
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Remaining Fiscal Year (in Dollars) |  |  | 27,000 |  |  |  |  |
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized, Next Twelve Months (in Dollars) |  |  | 53,000 |  |  |  |  |
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized In Year Two (in Dollars) |  |  | $ 19,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 2,388 |  | 0 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 2.79 |  | $ 0 |  |  |
The 2010 Stock Option Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 60,000 |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  | $ 7.85 |  |  |  |  |  |
The 2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |  |
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  | 33,910 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 2,388 |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  | 2,388 |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 2.79 |  |  |  |  |
Employee Stock Option [Member] | The 2010 Stock Option Plan [Member] |  |  |  |  |  |  |  |
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 55,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  | 0 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 5.00 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  | 5 years |  |  |  |  |
Employee Stock Option [Member] | The 2010 Stock Option Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |  |
Employee Stock Option [Member] | Contractual Term with One-third Yearly Vesting [Member] | The 2010 Stock Option Plan [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Share Based Compensation Maximum Contractual Term |  | 6 years |  |  |  |  |  |
Director Stock Options [Member] | The 2003 Outside Directors Stock Plan [Member] |  |  |  |  |  |  |  |
Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 166,635 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number |  |  | 166,635 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) |  |  | $ 8.88 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  | 4 years 219 days |  |  |  |  |
[1] | Options with exercise prices ranging from $2.79 to $14.75

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