Note 11 - Other Assets - Mortgage Loans and Other Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance	$ 14,448	$ 21,838	$ 23,197
New mortgage loans	3,750	14,825	0
Balance	7,829	14,448	21,838
Existing Mortgage Loan [Member]
Other additions	48	0	0
Foreign Currency Translation [Member]
Other additions	0	116	385
Amortization of Loan Discounts [Member]
Other additions	33	125	112
Loan Repayments [Member]
Collections of principal	(10,136)	(21,012)	0
Charge Off/Foreign Currency Translation [Member]
Other deductions	0	(155)	(449)
Collections of Principal [Member]
Collections of principal	(313)	(1,287)	(1,405)
Amortization of Loan Costs [Member]
Other deductions	$ (1)	$ (2)	$ (2)