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Note 8 - Target Asset Allocation (Details)
12 Months Ended
Dec. 31, 2015
Large Cap Value [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 50.00%
Large Cap Blend [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 50.00%
Large Cap Growth [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 50.00%
Mid-cap Blend [Member]  
Target Range Strategic Allocation 15.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 40.00%
Small Cap Core [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 25.00%
Foreign Large Blend [Member]  
Target Range Strategic Allocation 10.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 40.00%
Emerging Markets [Member]  
Target Range Strategic Allocation 10.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 25.00%
Real Estate [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 20.00%
US Treasury Securities [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 25.00%
Intermediate Term Bond [Member]  
Target Range Strategic Allocation 10.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 50.00%
US Government Agencies Debt Securities [Member]  
Target Range Strategic Allocation 5.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 40.00%
High Yield Bond [Member]  
Target Range Strategic Allocation 10.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 25.00%
Emerging Markets Bond [Member]  
Target Range Strategic Allocation 10.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 20.00%
Money Market Funds [Member]  
Target Range Strategic Allocation 0.00%
Target Range Lower Limit 0.00%
Target Range Upper Limit 100.00%