Object loading only once in a singleton eager loaded console app C#

using RydoZone;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RydoZone
{
    public sealed class Rydo
    {
        private static int counter = 0;
        //private static Rydo instance = null;

        private static Rydo instance = new Rydo();

        //private static object obj = new Object();
        public static Rydo GetInstance
        {
            get
            {
                return instance;
            }
        }
        private Rydo()
        {
            counter++;
            Console.WriteLine("Counter Value is" + counter.ToString());
        }
        private void PrintDetails()
        {
            Console.WriteLine("I am Print Method of Singleton Class");
        }

        public void ok()
        {
            Console.WriteLine("I am Print Method of Singleton Class");
        }
    }
}

public class Mained
{
    static void Main()
    {
        Parallel.Invoke(() => RydoCallfromHamas(), () => RydoCallfromUS()); // Dummy MultiThreaded Environment
        Console.ReadKey();
    }

    private static void RydoCallfromHamas()
    {
        Rydo r = Rydo.GetInstance;
        Console.WriteLine("Hamas got the Rydo Instance");
    }

    private static void RydoCallfromUS()
    {
        Rydo r = Rydo.GetInstance;
        Console.WriteLine("US got the Rydo Instance");
    }
}