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Note 1 - Summary of Operations and Significant Accounting Policies (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months (in Dollars) $ 401  
Finite-Lived Intangible Assets, Amortization Expense, Year Two (in Dollars) 308  
Finite-Lived Intangible Assets, Amortization Expense, Year Three (in Dollars) 229  
Finite-Lived Intangible Assets, Amortization Expense, Year Four (in Dollars) 167  
Finite-Lived Intangible Assets, Amortization Expense, Year Five (in Dollars) 122  
Foreign Currency Transaction Gain (Loss), Realized (in Dollars) (43) 95
Advertising Expense (in Dollars) 538 792
Recoveries Of Construction Costs (in Dollars) 91 254
Recoveries Of Project Research And Development Costs (in Dollars) $ 11 $ 56
Incremental Common Shares Attributable to Share-based Payment Arrangements (in Shares)   252,218
Number of Operating Segments 2  
Customer C [Member] | Sales Revenue, Goods, Net [Member]
    
Concentration Risk, Percentage 21.00% 21.00%
Customer A [Member] | Accounts Receivable [Member]
    
Concentration Risk, Percentage 22.00%  
Customer B [Member] | Accounts Receivable [Member]
    
Concentration Risk, Percentage 12.00%  
Stock Options, Warrants And Restricted Stock Awards [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) 2,211,488 2,105,228
Sales Revenue, Goods, Net [Member]
    
Number Of Major Customers 1 1
Accounts Receivable [Member]
    
Number Of Major Customers 2