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Note 8 - Common shares: (Detail) (USD $)
 1 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Jan. 31, 2013
Mar. 16, 2012
Jan. 23, 2012
Nov. 11, 2011
Feb. 16, 2010
Dec. 31, 2012
Dec. 31, 2011
Common Stock, Shares Authorized           250,000,000 250,000,000
Common Stock, Shares, Outstanding     46,047,053     44,322,159 53,497,584
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     7,570,236 3,840,000      
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)     $ 0.77        
Stock Repurchased During Period, Value (in Dollars) $ 6,171,656   $ 5,829,082 $ 18,442      
Stock Repurchased And Retired During Period Transaction Cost (in Dollars)     64,000        
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)     4,000,000        
Stock Repurchased During Period, Shares     4,114,437 23,765 2,371,204    
Share Price (in Dollars per share)     $ 1.50 $ 0.78      
Stock Repurchase Program, Authorized Amount (in Dollars)   $ 3,840,000