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Note 6 - Leases - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Other assets - right-of-use assets, operating leases $ 1,260    
Other assets - right-of-use assets, financing leases 550    
Other assets - right-of-use assets, total 1,810    
Present value of lease liabilities 1,810  
Accrued Expenses [Member]      
Accrued expenses - current portion of lease liabilities, operating leases 520    
Accrued expenses - current portion of lease liabilities, financing leases 120    
Accrued expenses - current portion of lease liabilities, total 640    
Other Noncurrent Liabilities [Member]      
Other long-term liabilities - non-current portion of lease liabilities, operating leases 730    
Other long-term liabilities - non-current portion of lease liabilities, financing leases 440    
Other long-term liabilities - non-current portion of lease liabilities, total 1,170    
Accrued Expenses and Other Noncurrent Liabilities [Member]      
Total lease liabilities, operating leases 1,250 $ 1,600  
Total lease liabilities, financing leases 560    
Present value of lease liabilities $ 1,810