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Note 6 - Loan Payable (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2011
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2012
Stock Repurchase [Member]
Mar. 31, 2013
Dutch Auction Member
Mar. 31, 2012
Dutch Auction Member
Dec. 31, 2012
Bank of Montreal (“BMO”) U.S. Base Rate Plus Percent [Member]
Dec. 31, 2012
LIBOR Plus Percent [Member]
Mar. 31, 2013
Foreign Exchange Risk [Member]
Mar. 31, 2013
Operating Demand Loan [Member]
Mar. 31, 2013
DLR Loan [Member]
Dec. 31, 2012
DLR Loan [Member]
Dec. 31, 2012
Revolving Demand Loan Facilities [Member]
Line of Credit Facility, Maximum Borrowing Capacity                     $ 3,500,000 $ 1,000,000   $ 14,000,000 $ 14,000,000
Debt Instrument, Basis Spread on Variable Rate                 1.25% 2.50%   1.25%   1.25%  
Line of Credit Facility Share Repurchase Limit                             2,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.20%                  
Line of Credit Facility Maturity       4 years                      
Line of Credit Facility, Amount Outstanding 5,200,000 5,200,000                   0 2,900,000 3,700,000  
Line of Credit Facility, Increase, Additional Borrowings     5,200,000                        
Stock Repurchased During Period, Shares (in Shares)               4,114,121              
Share Price (in Dollars per share)               $ 1.50              
Stock Repurchased and Retired During Period, Value 6,171,656 822,887         6,171,656                
Stock Repurchased And Retired During Period Transaction Cost             106,000                
Line of Credit Facility, Covenant Period                     18 months        
Derivative Asset, Fair Value, Gross Asset   (192,144)     444,782           23,300,000        
Line of Credit Facility, Monitoring Fee                       500      
Maximum Total Funded Debt To EBITDA Ratio   2.00:1                          
Line of Credit Facility Maximum Annual Capital Expenditure Ceiling       $ 3,600,000