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Note 9 - Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Land $ 2,510 $ 2,510  
Buildings 6,066 6,066  
Equipment 19,186 19,999  
Furniture and fixtures 751 800  
Leasehold improvements 2,182 2,247  
Transportation equipment 664 622  
Property leased to others 4,141 4,274  
35,500 36,518  
Buildings 1,947 1,807  
Equipment 18,014 19,261  
23,712 24,602  
Property and equipment pending for inspection 1,926 1,839  
Total 13,714 13,755 $ 13,736
Furniture and Fixtures [Member]      
Accumulated depreciation 735 769  
Leasehold Improvements [Member]      
Accumulated depreciation 2,064 1,898  
Transportation Equipment [Member]      
Accumulated depreciation 537 544  
Property Leased to Others [Member]      
Accumulated depreciation $ 415 $ 323