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Note 4 - Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 29, 2019
Sep. 30, 2018
Operating cash flows from operating leases   $ 1,074  
Operating cash flows from finance leases   266  
Financing cash flows from finance leases $ 466 $ 466 $ 691