Note 11 - Mortgages and Other Financing Receivables - Mortgage Loans and Other Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance at January 1	$ 23,824	$ 74,013	$ 30,243
New mortgage loans		5,730	52,728
Balance at December 31	23,197	23,824	74,013
Write-off of Loan Discounts [Member]
Other additions			286
Foreign Currency Translation [Member]
Other additions	397
Amortization of Loan Discounts [Member]
Other additions	112	112	126
Loan Repayments [Member]
Collections of principal		(53,646)	(7,330)
Charge Off/Foreign Currency Translation [Member]
Other deductions	(213)	(884)	(1,066)
Collections of Principal [Member]
Collections of principal	(921)	(1,499)	(972)
Amortization of Loan Costs [Member]
Other deductions	$ (2)	$ (2)	$ (2)