Note 10 - Mortgages and Other Financing Receivables - Mortgage Loans and Other Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance	$ 21,838	$ 23,197	$ 23,824
New mortgage loans	14,825
Balance	14,448	21,838	23,197
Foreign Currency Translation [Member]
Other additions	116	385	397
Amortization of Loan Discounts [Member]
Other additions	125	112	112
Loan Repayments [Member]
Collections of principal	(21,012)
Charge Off/Foreign Currency Translation [Member]
Other deductions	(155)	(449)	(213)
Collections of Principal [Member]
Collections of principal	(1,287)	(1,405)	(921)
Amortization of Loan Costs [Member]
Other deductions	$ (2)	$ (2)	$ (2)