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Note 5 - Leasing Arrangements - Rental Income under Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Minimum rentals $ 2,495 $ 2,458
Percentage rentals 1,255 1,172
Licensing fees 868 814
Other (primarily common area recoveries) 909 880
Total $ 5,527 $ 5,324