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Note 9 - Summary of Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) [Member] - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Outstanding, Beginning Balance (in shares) 135,600  
Outstanding, Beginning Balance (in dollars per share) $ 422.31  
Outstanding, Beginning Balance (in dollars per share) $ 87.22  
Outstanding, Beginning Balance 9 years 146 days 9 years 255 days
Granted (in shares)  
Granted (in dollars per share)  
Granted (in dollars per share)  
Outstanding, Ending Balance (in shares) 135,600 135,600
Outstanding, Ending Balance (in dollars per share) $ 422.31 $ 422.31
Outstanding, Ending Balance (in dollars per share) $ 87.22 $ 87.22