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Note 6 - Fair Value Measurements (Detail) - Fair Value Long-term Debt (USD $)	Mar. 31, 2013	Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member]
Notes payable	$ 160,328,713	$ 171,841,824

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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