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Note 5 - Employee Benefit Plans (Detail) - Other changes in plan assets and benefit obligations recognized in other comprehensive income: (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Net actuarial loss | $ 308,402 | $ 560,043 | $ 102,084 |
| Recognized actuarial loss | (113,723) | (61,309) | (50,553) |
| Recognized prior service cost | (8,596) | (8,596) | (9,416) |
| Total recognized in other comprehensive income, before taxes | 186,083 | 490,138 | 42,115 |
| Total recognized in net benefit cost and other comprehensive income, before taxes | $ 333,608 | $ 646,767 | $ 214,648 |
| X | ||||||||||
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- Definition
Before tax amount of the benefit improvement costs resulting from a plan amendment that occurred that has not been recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Before tax amount, net of reclassification adjustments, of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Before tax amount of the gain (loss) adjustment to other comprehensive income (loss) resulting from the settlement or curtailment of the entity's defined benefit pension and other postretirement plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Before tax amount, net of reclassifications, of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Before tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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