Note 11 - Short-term Debt (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Short-term Debt, Total	$ 0	$ 0
Unsecured Lines of Credit [Member]
Line of Credit Facility, Current Borrowing Capacity	68,000
Unsecured Lines of Credit [Member] \| Federal Home Loan Bank [Member]
Line of Credit Facility, Current Borrowing Capacity	$ 216,600

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant