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Note 9 - Leases - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Other assets - right-of-use assets, operating leases $ 1,389 $ 1,600  
Other assets - right-of-use assets, financing leases 279    
Other assets - right-of-use assets, total 1,668    
Total lease liabilities, operating leases 1,388 $ 1,600  
Total lease liabilities, financing leases 279    
Present value of lease liabilities 1,667  
Accrued Expenses [Member]      
Accrued expenses - current portion of lease liabilities, operating leases 668    
Accrued expenses - current portion of lease liabilities, financing leases 53    
Accrued expenses - current portion of lease liabilities, total 721    
Other Noncurrent Liabilities [Member]      
Other long-term liabilities - non-current portion of lease liabilities, operating leases 720    
Other long-term liabilities - non-current portion of lease liabilities, financing leases 226    
Other long-term liabilities - non-current portion of lease liabilities, total $ 946