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Borrowings (Details) (Revolving credit facilities, USD $)	Mar. 31, 2014
Revolving credit facilities
Borrowings
Maximum borrowing capacity	$ 60,000,000
Line of Credit Facility, Current borrowing base	48,100,000
Amount outstanding	$ 10,600,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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