Note 5 - Share-Based Compensation (Details) (USD $) | 6 Months Ended |
Jun. 30, 2014 | Jun. 30, 2013 |
Common Class A [Member] | The 2001 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 1,800,000 | ' |
Common Class A [Member] | 2004 Director Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance | 1,650,000 | ' |
Common Stock Options Granted To Directors | 36,000 | ' |
Common Class A [Member] | The 2006 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 1,800,000 | ' |
Common Class A [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 204,166 | 232,344 |
Common Class B [Member] | The 2001 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 300,000 | ' |
Common Class B [Member] | 2004 Director Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance | 275,000 | ' |
Common Stock Options Granted To Directors | 6,000 | ' |
Common Class B [Member] | The 2006 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 300,000 | ' |
Common Class B [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 32,217 | 38,718 |
Normal Term [Member] | 2004 Director Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Goods and Nonemployee Services Transaction Option Terms | '10 years | ' |
Termination of Service [Member] | 2004 Director Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Goods and Nonemployee Services Transaction Option Terms | '3 years | ' |
Employee Stock Option [Member] | 2004 Director Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Goods and Nonemployee Services Transaction Vesting Period | '1 year | ' |
Employee Stock Option [Member] | Minimum [Member] | The 2001 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | '1 year | ' |
Employee Stock Option [Member] | Maximum [Member] | The 2001 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | '5 years | ' |
Nonvested [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) | 120,000 | ' |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | '1 year 6 months | ' |
Minimum [Member] | The 2001 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement By Share-based Payment Award Option Term | '5 years | ' |
Minimum [Member] | The 2006 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement By Share-based Payment Award Option Term | '5 years | ' |
Maximum [Member] | The 2001 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement By Share-based Payment Award Option Term | '10 years | ' |
Maximum [Member] | The 2006 Equity Incentive Plan [Member] | ' | ' |
Note 5 - Share-Based Compensation (Details) [Line Items] | ' | ' |
Share-based Compensation Arrangement By Share-based Payment Award Option Term | '10 years | ' |