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Note 10 - Mortgages and Other Financing Receivables - Mortgage Loans and Other Financing Receivables (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance at January 1 $ 23,197 $ 23,824 $ 74,013
New mortgage loans 5,730
Balance at December 31 21,838 23,197 23,824
Foreign Currency Translation [Member]      
Other additions 385 397
Amortization of Loan Discounts [Member]      
Other additions 112 112 112
Loan Repayments [Member]      
Collections of principal (53,646)
Charge Off/Foreign Currency Translation [Member]      
Other deductions (449) (213) (884)
Collections of Principal [Member]      
Collections of principal (1,405) (921) (1,499)
Amortization of Loan Costs [Member]      
Other deductions $ (2) $ (2) $ (2)