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Note L - Commitments and Contingent Liabilities (Details Textual) | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 22, 2007
--- | --- | --- | ---
Debt Instrument, Interest Rate, Stated Percentage | 4.47% | 3.27% | 6.58%
Minimum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.50% |  |
Maximum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.09% |  |
Fixed Rate Commitments [Member] | Minimum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% |  |
Long-term Debt, Term | 15 years |  |
Fixed Rate Commitments [Member] | Maximum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.00% |  |
Long-term Debt, Term | 30 years |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References 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=99377789&loc=d3e19207-110258 + Details
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