Note 7 - Stock-based Compensation Plan (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 65 Months Ended |
Nov. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 | Dec. 31, 2014 |
Note 7 - Stock-based Compensation Plan (Details) [Line Items] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | | | | 80,000 | | | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) | | | | $5.96 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) | 6,666 | | | 36,663 | | | 65,663 |
Proceeds from Stock Options Exercised | $23,000 | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 14,000 | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares) | | | | | | | 4,268 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share) | | $7.77 | | $7.77 | | $6.55 | $7.77 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | | 0.96% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | | 49.00% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | | 3 years | | | |
Dividends | | | | 0 | | 0 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | | | | $2.02 | $1.31 | | |
Allocated Share-based Compensation Expense | | 152,000 | 266,000 | 477,000 | 910,000 | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | | 1,078,000 | | 1,078,000 | | | 1,078,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | | 860,000 | | 860,000 | | | 860,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | | | | 3 years | | | |
Employee Stock Option [Member] | The 2009 Stock Plan [Member] | | | | | | | |
Note 7 - Stock-based Compensation Plan (Details) [Line Items] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) | | 1,687,500 | | 1,687,500 | | | 1,687,500 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | 3 years | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | | | | 5 years | | | |
New Employees [Member] | | | | | | | |
Note 7 - Stock-based Compensation Plan (Details) [Line Items] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 5 years | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) | 5,000 | | | | | | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) | $5.90 | | | | | | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $10,000 | | | | | | |
Board of Directors [Member] | | | | | | | |
Note 7 - Stock-based Compensation Plan (Details) [Line Items] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | | 2.11% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | | 57.00% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | | 7 years | | | |
Officer [Member] | | | | | | | |
Note 7 - Stock-based Compensation Plan (Details) [Line Items] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | | 1.51% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | | 55.00% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | | 4 years | | | |
Non-executive Employees [Member] | | | | | | | |
Note 7 - Stock-based Compensation Plan (Details) [Line Items] | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | | 0.71% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | | 49.00% | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | | 3 years | | | |