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Income taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred income tax assets:    
Allowances not currently deductible $ 367 $ 449
Depreciation and amortization 414 376
Equity compensation not currently deductible 864 548
Net operating loss carryforwards 2,622 2,546
Expenses not deductible until paid 1,305 1,055
Tax credit carryforwards 176 176
Derivatives 0 659
Other 204 11
Totals 5,952 5,820
Deferred income tax liabilities:    
Derivatives (46) 0
Other (193) (162)
Totals (239) (162)
Net deferred tax assets 5,713 5,658
Net deferred income tax asset-current 1,104 1,934
Net deferred income tax asset-long term 4,848 3,886
Net deferred income tax liability-current (57) (9)
Net deferred income tax liability-non-current (182) (153)
Net deferred income tax assets $ 5,713 $ 5,658