Note L - Commitments and Contingent Liabilities (Details Textual) - Fixed Rate Commitments [Member]	Dec. 31, 2019
Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Long-term Debt, Term	15 years
Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Long-term Debt, Term	30 years

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_LongTermDebtTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant