v3.25.2
Shareholder Report, Holdings (Details)
Jun. 30, 2025
C000014124 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
Percent of Total Investments 100.00% [1]
C000014124 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [1]
C000014124 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 46.00% [1]
C000014124 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00% [1]
C000014124 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 19.00% [1]
C000014124 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.00% [1]
C000014124 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.00% [1]
C000014124 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.00% [1]
C000014124 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.00% [1]
C000014124 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00% [1]
C000014124 [Member] | Stock with Fixed Exchange Ratio Collar [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50% [2]
C000014124 [Member] | Financial [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.40%
C000014124 [Member] | Stock with Fixed Exchange Ratio [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.70% [2]
C000014124 [Member] | Undetermined [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50% [2]
C000014124 [Member] | Cash and Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [2]
C000014124 [Member] | Strategic [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.60%
C000014124 [Member] | Cash [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 68.10% [2]
C000129310 [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 100.00%
Percent of Total Investments 100.00% [3]
C000129310 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.00% [3]
C000129310 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 46.00% [3]
C000129310 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00% [3]
C000129310 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 19.00% [3]
C000129310 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.00% [3]
C000129310 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 6.00% [3]
C000129310 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.00% [3]
C000129310 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.00% [3]
C000129310 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00% [3]
C000129310 [Member] | Stock with Fixed Exchange Ratio Collar [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.50% [4]
C000129310 [Member] | Financial [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.40%
C000129310 [Member] | Stock with Fixed Exchange Ratio [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 22.70% [4]
C000129310 [Member] | Undetermined [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.50% [4]
C000129310 [Member] | Cash and Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.20% [4]
C000129310 [Member] | Strategic [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 85.60%
C000129310 [Member] | Cash [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 68.10% [4]
[1] Percentage of total investments as of June 30, 2025.
[2] Data expressed as a percentage of long common stock, corporate bonds and swap contract positions as of June 30, 2025.
[3] Percentage of total investments as of June 30, 2025.
[4] Data expressed as a percentage of long common stock, corporate bonds and swap contract positions as of June 30, 2025.