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Note 6 - Fair Value Measurements (Details) (USD $)	12 Months Ended
Note 6 - Fair Value Measurements (Details) (USD $)	Dec. 31, 2013 acre	Dec. 31, 2014
Disclosure Text Block [Abstract]
Long-term Debt	$ 49,000,000us-gaap_LongTermDebt	$ 50,176,000us-gaap_LongTermDebt
Area of Land Transferred (in Acres)	8mlp_AreaOfLandTransferred
Nonmonetary Transaction, Gain (Loss) Recognized on Transfer	$ 773,000

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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