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Note 6 - Defined Benefit Plan (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | Pension Benefits |
|  | Six Months Ended June 30, |
|  | 20 17 |  |  | 20 16 |
Service cost |  | $ | 346 |  |  | $ | 348 |
Interest cost |  |  | 372 |  |  |  | 378 |
Expected return on plan assets |  |  | (548 | ) |  |  | (544 | )
Amortization of prior service cost |  |  | (54 | ) |  |  | (54 | )
Recognized net actuarial loss |  |  | 270 |  |  |  | 286 |
Net periodic benefit c ost |  | $ | 386 |  |  | $ | 414 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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