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Note 5 - Employee Benefit Plans (Detail) - Summary of benefit payments over ten years: (USD $)
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Dec. 31, 2018
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Dec. 31, 2017
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Dec. 31, 2016
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Dec. 31, 2015
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Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|---|---|---|---|
| 2013 | $ 211,413 | |||||
| 2014 | 207,756 | |||||
| 2015 | 204,017 | |||||
| 2016 | 204,168 | |||||
| 2017 | 201,076 | |||||
| 2018 to 2022 | $ 1,270,581 |
| X | ||||||||||
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- Definition
Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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