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Note 1 - Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Beginning Balance $ 1,681 $ 1,533 $ 1,339 $ 1,407
Additions Charged to Expense (net of recoveries) 736 216 1,371 463
Reductions for Amounts Written Off (317) (58) (610) (179)
Ending Balance $ 2,100 $ 1,691 $ 2,100 $ 1,691