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Note 2 - Summary of Significant Accounting Policies (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2011
Contract Receivable Retainage (in Dollars) $ 397,000       $ 474,000
Cash Collateral for Borrowed Securities (in Dollars) 1,000,000       1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 15,296,000 5,254,000 5,254,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) $ 300,000 $ 400,000 $ 400,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 219 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) 10,000 615,000   1,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in Shares) 89,000 363,000 850,000    
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares)   115,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares)   7,500      
Standard Product Warranty Description one to five years        
Months [Member]
          
Contract Receivable Retainage, Description three to eighteen months        
Percentage [Member]
          
Contract Receivable Retainage, Description 5%        
Percentage [Member]
          
Contract Receivable Retainage, Description 10%