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Note 8 - Stock-Based Compensation Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)   325,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)   $ 3.58    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   5 years 292 days   5 years 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 1.40 $ 1.99    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)   $ 0 $ 47  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) $ 2,234 $ 2,234    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2 years 328 days    
Fiscal 2014 [Member] | Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fiscal Vesting Percentage   25.00%    
Fiscal 2015 [Member] | Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fiscal Vesting Percentage   25.00%    
Fiscal 2016 [Member] | Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fiscal Vesting Percentage   50.00%    
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Employees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)   257,500    
Share Based Compensation, Options, Expiration Term   10 years    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)   $ 3.61    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   9 years 109 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)   $ 2.01    
Members of the Board of Directors [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)   67,500    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)   $ 3.46    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term   9 years 219 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)   $ 1.92