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Real Estate Investments (Acquisitions) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
May 18, 2018
USD ($)
ft²
Feb. 23, 2018
USD ($)
ft²
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
ft²
property
Dec. 31, 2016
USD ($)
Sep. 27, 2018
USD ($)
Note 2 - Real Estate Investments (Details) [Line Items]            
Document Period End Date     Dec. 31, 2018      
Number of properties acquired | property       10    
Proceeds from sale of real estate     $ 26,880 $ 0 $ 0  
Gain on sale of real estate     5,890 0 $ 0  
West Coast            
Note 2 - Real Estate Investments (Details) [Line Items]            
Adjusted purchase price       $ 313,000    
Area of real estate property (in Square Feet) | ft²       1,100    
Stadium Center | Tacoma, Washington            
Note 2 - Real Estate Investments (Details) [Line Items]            
Adjusted purchase price   $ 19,300        
Area of real estate property (in Square Feet) | ft²   49        
King City Plaza | King City, Oregon            
Note 2 - Real Estate Investments (Details) [Line Items]            
Adjusted purchase price $ 15,700          
Area of real estate property (in Square Feet) | ft² 63          
Round Hill Square | Zephyr Cove, Nevada            
Note 2 - Real Estate Investments (Details) [Line Items]            
Sales Price of Property Sold           $ 28,000
Proceeds from sale of real estate     26,900      
Gain on sale of real estate     $ 5,900