2.4.0.8032 - Disclosure - Note 3 - Details of Selected Balance Sheet Accounts (Details) - Accrued LiabilitiestruefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$c4_AsOf30Jun2013http://www.sec.gov/CIK0001121484instant2013-06-30T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$c5_AsOf31Dec2012http://www.sec.gov/CIK0001121484instant2012-12-31T00:00:000001-01-01T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 2ois_AccruedLiabilitiesAbstract0ois_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Accrued liabilities:2false 3us-gaap_EmployeeRelatedLiabilitiesCurrentus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse4514400045144USD$falsetruefalse2truefalsefalse6920600069206USD$falsetruefalsexbrli:monetaryItemTypemonetaryTotal of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. 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