Note 4 - Common Shares (Detail)	Dec. 31, 2012	Dec. 31, 2011
Common Stock, Shares, Issued	22,111,675	23,644,301
Common Stock, Shares, Outstanding	22,102,549	23,644,301
Nil Coupon Perpetual Loan Notes [Member]
Common Stock, Capital Shares Reserved for Future Issuance	6,715	6,715
Stock Options [Member] | Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards [Member]
Common Stock, Capital Shares Reserved for Future Issuance	1,833,500	1,718,062
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards [Member]
Common Stock, Capital Shares Reserved for Future Issuance	2,666,024	2,309,165